HiI teach Spinning and will say the knees could be the fore/aft position. Sometimes even if you are set up right (by yourself, and/or instructor) the seat slider can come slightly loose, and shift during a ride. Simply use your brake to stop your bike mid class, re-check it, and adjust / tighten to the correct position.
In terms of resistance level, I always tell my students at the beginning of every class, and remind during, that any knee pain... back it off... listen to your body... always "muscles working / challenge... never knee joint hurting / injured".
The toe cages are generally sized to fit a man's street shoe US 10. If your foot is not that, you make some compromises to make it work. I wish as an instructor that cycling shoes & cleats could come free to students that commit to ride. It makes such a huge difference. For most people it's a money issue in buying them. Ride once with them, you would never want to go back.
Good Luck.
p.s. edit/add: also, besides not mashing... focus on pulling up (upstroke)... this is where being clipless really helps too... it's another way to get intenstiy & work on your form... sometimes I cue for my students to pretend they "have a piece of paper sliding under the ball of their foot, i.e. don't mash"... it's really a challege to do & something everyone needs reminder of.




I teach Spinning and will say the knees could be the fore/aft position. Sometimes even if you are set up right (by yourself, and/or instructor) the seat slider can come slightly loose, and shift during a ride. Simply use your brake to stop your bike mid class, re-check it, and adjust / tighten to the correct position.
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