We already have quite a few bodyweight exercises on the site, though the scoring system for them is a little borked and is in need of an overhaul. Yoga is also on the site as well.
Regarding the internal server error, did that occur right after Step 2 or was it when you attempted to finish the sign-up process?
Regarding the internal server error, did that occur right after Step 2 or was it when you attempted to finish the sign-up process?