lying supine, lift both feet off floor with knees bent at 90 degrees, lower with control, repeat.
Lie on the back with feet on the floor and knees bend and arms by the side. Lift both feet off the floor by knees bend at 90 degrees. Lower the feet on the floor with maintaing knee at 90 bend. Repeat.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.
