My knees have started bothering me lately, and I'm pretty sure that the vertical lunge stretches in the Front Split Series are part of the issue.
In both of these stretches I feel a lot of pressure on the kneecap of the leg that's against the wall, even though I'm using a thick padded gymnastics mat to cushion my knee where it meets the floor.
I'd like to substitute another stretch here for a few weeks and see if my knees improve.
What would be some good options to sub in here?