Right now I'm doing 3sets of 5reps (5reps with the left, and 5reps with the right leg are making a set), but I think I'd better check with my Gymnastic Bodies fellas whats the correct form, before I increase my repetitions. So:
Is it OK for the back to round? Because I find it impossible to keep a straight back like I would with the barbell (two-legged) squat?
Where do the arms go? Should I extend both of my arms forward, or to the sides like an iron cross?
Should the passive leg be fully extended (90 degrees to the working leg/parallel to the ground) all the time, or is it OK to go from like 45degrees while up to 90degrees while down?