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Originally posted 2018-05-31 23:40:19.
While it may seem redundant to say, most indoor bikes do not move. Please, stop and think about that for a moment. We are not talking about forward motion or distance, of course an indoor bike (or an outdoor bike on a trainer) does not move forward. But what about the other motions that are involved in cycling.
When a rider is out of the saddle, most riders sway the bike from side to side a bit. Why does this happen? Generally, it is the mechanical reality of the situation due to applying extreme power to each pedal. Since the pedals are not on the centerline of the bike, applying a large force to the right pedal will, physically speaking, apply a rotational force that pushes the top of the bike to the right and the bottom of the bike to the left. Without this counterbalancing motion, the wheel would kick out to the side. By swaying the bike in the opposite direction, the amount of force that can be applied to the pedals is increased without crashing.
The second primary aspect of swaying the bike is that it allows the rider to engage their upper body (especially core and arms) into the movement which increases power.
Take a moment and watch some of the pros race, they only have about a 12 degree sway; less than most avid riders. This is due to their efficiency and power.
The second motion that we want to consider is the flexibility of the bike frame. I learned a great deal about this from Kirk Frameworks Co. (http://kirkframeworks.com). There are three basic types of frame flex: Vertical, Torsional and Bottom Bracket/Drivetrain. It is important to understand that these different types of frame flex are more or less related to each other.
Vertical Flex
A frame with the proper amount of vertical flex will have a very smooth ride. More importantly, it also offers better control and handling.
Lateral/Torsional Flex
Torsional flex is when the head tube and seat tube are twisted relative to each other, and thus are no longer in the same plane. All frames, regardless of material or quality have a good deal of torsional flex. Try this sometime — sit on your bike with it pointed straight at a mirror. With your butt on the saddle and your hands on the brake hoods, push your hands to the left and your butt to the right. Watch the frame twist.
Bottom Bracket/Drivetrain
When a rider pushes down on the pedal he also, for better or worse, pushes sideways. This is because the pedal is off to the side of the bike and is not in the bike’s centerline.
When the rider pushes down with the right foot the bottom bracket flexes to the left. When the bottom bracket is pushed to the side, it stays there until the force that was holding it there is released. So at the top of the pedal stroke the bottom bracket starts its sideways move and at the bottom of the stroke it returns to neutral. In returning to neutral it applies that returned energy to the drive train and then to the road. This flex and return smoothes out our power transmission to the ground, making acceleration smoother and optimizing traction.
With the exception of a few new bikes on the market, most indoor bikes do not provide movement side-to-side. Because of this limitation, riders must emphasize relaxation when riding and allow gentle upper-body movement. Attempting to maintain a still upper body can place the spine and surrounding muscles at risk from the forces being generated by the legs.
Originally posted 2019-02-08 21:41:46.
This a a great question that we get often. I loved John's answer, and so I have done a few edits and present it here….. Joey
A great questions from one of the riders in a Performance Cycle class. An observation that shows he's paying attention plus it gives me the chance to clear this up, so you can properly explain this anomaly to your participants.
The short answer is you don't* If resistance and cadence remains the same, in or out of the saddle doesn't matter. The amount of power/watts you are creating doesn't change… because it can't.
The bike decides the right amount of power
You know that Power = Force x Cadence. So let's assume this participant is riding seated and pedaling @80RPM. Their resistance is set to a level that results in the console display showing 150 watts.
Our legs create the perfect amount of force required to get the job done, which in this instance is overcoming the resistance to pedal @ 80RPM. If your resistance setting on the cycle requires “X” amount of force to push down the pedal, your muscles will create exactly “X” – no extra force is created and no less. The combination of that force, multiplied by a cadence of 80 RPM results in the power meter showing 150 watts.
In fact there's an actual law of physics that says that it's impossible to get the same amount of power out of a machine with a reduced amount of power added into it – which is why I'm saying the amount of power/watts you are creating stays exactly the same, if you make no change other than to stand and ride out of the saddle.
My response was; “you're right it does and there's a simple answer why…
Let me begin with the basics. I teach at a Life Time Fitness Athletic Club and we ride FreeMotion S11.9 with the Carbon Drive belts. FreeMotion's measure power only through the left crankarm as you can see here.
This is my personal S11.0 (the home version) which is why it's black and not the normal silver color. The electronics are identical across all models.
Yes, the meter shows a drop in power…
Many of us who teach or ride on this Indoor Cycle have noticed that the power meter will show a lower wattage number when you transition out of the saddle, without giving any thought as to why. As I explained above, it shouldn't > the wattage number should remain the same. Again; Power is equal to force times cadence. If you didn't change the resistance setting, and you're maintaining the same cadence, the power meter should continue to show the same wattage… but it doesn't because >>>> your legs aren't the same strength.
Your dominate (stronger) leg does more work
The force required to pedal is divided between your two legs – but not equally. Because many (if not all) of us have one leg that's stronger than the other, our brains automatically proportion the amount of force from each. Remember: our legs only create exactly what's needed. Unless you consciously choose otherwise > more force is unconsciously asked from the stronger leg and the opposite leg adds what's left, equaling the total required.
Some quick research showed me that it's very common for one leg to be stronger in most people. Your dominant/stronger leg is typically the same as your writing hand. Since ~90% of people are right handed, the majority of your class will be seeing lower wattages when the come out of the saddle > because they are doing more work with their right leg. The FreeMotion's left hand power meter sensors are seeing a lower amount, of the total amount of work, as coming from your left leg.
Because this IC can only sense force on the left side, when you stand your stronger leg carries a greater percentage of your body weight = the wattages appear lower.
So standing or seated at the same cadence, you continue to create the exact same amount of power. It's just that the power meter doesn't see all of it and displays the reduced amount = the misperception that we create less power standing… which you now understand isn't true 🙂
Make this a feature (not a bug) in your class
Since the Freemotion can show leg strength disparity, why not use it as a training tool?
Novel idea, right?
Start by teaching everyone which leg is their stronger/dominate leg. The simplest way I know is by doing Step-Ups on a box or step raised to the proper level as shown in this short video.
This exercise was eye opening to me, when we did them in Boot Camp. Learning that my right leg is considerably stronger, I'm now really focusing on making my left leg do more work. Hopefully over time, a stronger left leg will result in me having a higher FTP and greater overall muscular endurance.
I suggest having your riders do this as an after class activity > or you could bring a box into your studio and have everyone take a turn.
Using a pair of reasonably sized dumbbells, perform 8-12 reps all on one side and then the other. It should be quickly apparent which (or if) they have a leg strength disparity.
We'll explore drills to exploit this feature and help riders train their weaker leg in future posts! [/wlm_private]
* I'm not referring to pedaling efficiency here, which is a completely different subject.
** Please let me know if this isn't clear, if I've confused you or you have an alternate method of explaining this.
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Originally posted 2017-09-14 07:38:43.
NOTE: I'll be publishing what I believe are the 10 Myths of Indoor Cycle Rider Setup / Bike Fit on Wednesdays each week, starting today with:
Myth #1 – It's proper, for you the instructor, to cue people to draw in their knees.
I cringe whenever I hear; “OK people, now I want everyone to bring in your knees!” because, for most of the riders in class, everyone's knees are already where they need to be. Please note that I didn't say where they should be, but where they need to be based on a number of different factors. Some are based on how the rider is fitted to the cycle and some are because…
Indoor Cycles are perfectly symmetrical – Humans, not so much…
You can find dozens of books and multiple business who focus on the art of fitting an imperfect cyclist to a perfect bicycle. Discussions of Leg Length Discrepancies, Feet Pronation, Q Factor and Cycling Shoe Cleat Wedges are beyond the scope of an Indoor Cycle Instructor helping a student with setup.
But there is one aspect of Indoor Cycle setup that has a huge influence on knee position, and yet is universally ignored*- foot alignment.
Take a minute and try his test on yourself: Stand on a smooth floor wearing your socks. Feet shoulder width apart, with a soft bend in your knees (like you should have on the bike). Now transfer the majority of your weight to the balls of your feet (like you're standing on the pedals) and rotate your heels inward. Notice where your knees go?
For most of us they move out, did they for you [wlm_firstname]?
Now let's see what happens when you arbitrarily decide; “my knees are sticking out, I need to bring them in.” Go to the same position as before; soft bend, heels in, but now bring some of your weight back to your heels which will prevent your feet from moving (similar to how the pedal cages or cleats fix the position of your feet) and try to bring your knees in. What happened?
Because everything is connected (you remember the song; foot bone's connected to the ankle bone, the ankle bone's connected to the thigh bone, the thigh bone's connected to the knee bone, etc…) the position of your knee is exactly where it needs to be, based on your position on the cycle. If you have a student with improperly adjusted shoe cleats (or too low a saddle) and you tell them in your BIG INSTRUCTOR VOICE; “I want everyone to bring in your knees during this crushing 11 minute climb!” you could potentially hurt them over time. Worse, cause them to ignore the true reason their knees are out which for many people is simply having their heels rotated inward – like my buddy Randy demonstrates below.
Heels rotated in forces knees out
Feet aligned forward bring knees over pedal 🙂
There's actually a Sub- Myth here; the objective of proper bike fit isn't to just “bring in your knees”. The objective is to get your knee pushing directly down on your pedal = the most efficient transfer of power with the least amount of stress on the most vulnerable joint in the system – your knees. We live in a three dimensional world, not two 🙁 So when while helping a student get set up, be sure to observe them from the front, as well as from the side.
So what to do and/or cue as the Instructor?
Jim Karanas gave us a beautiful cue during a class I took last week in San Francisco. He had us down in the drops (I realize your cycle may not have drops – Spinning Instructors can read this as comfortably in position 2) and asked that we look down and we should see our knees in the space between our arms. Nothing more. He was simply suggesting that we observe what was happening.
You haven't heard it yet, but I will be publishing an interview with Jay Blahnik in December where he makes a similar point about suggesting your students observe something and then let them act on it.
You may also pay attention to what you see in your students and identify excessive foot rotation. But be careful – some people are naturally very duck footed (or whatever the opposite of pigeon toed is where you live) so my suggestion is to ask “did you have someone set up your cleats? This may give you a clue to if they put any thought or care into attaching their cleats. You could also have them stand naturally in their socks on a smooth floor to see if there's anything weird and refer them to your local bike fit expert if necessary.
*There are 100's of YouTube videos explaining a multitude of different ways to properly fit someone to an Indoor Cycle, but not one that I'm aware of makes any comment or suggestions as to foot position and it's effect on knee position / alignment. Even the Spinning® Fit System ignores this topic beyond “… the cleats must be adjusted properly on the shoe. A good bike shop or bike fit specialist can help with this if needed.” What “adjusted properly” means remains a mystery.
Read the rest of the 10 Myths of Indoor Cycle Rider Setup / Bike Fit
Originally posted 2012-11-21 12:19:18.
https://music.apple.com/us/playlist/2018-holiday-ride/pl.u-1Bj1tABz9LEWelcome to the The Weekly Ride by Cycling Fusion
Originally posted 2018-12-18 21:31:33.
Welcome to the The Weekly Ride by Cycling Fusion:
Originally posted 2018-02-13 09:00:43.