I wonder what is the shortest duration I can split 2x20 intervals into to keep them effective? What recovery period between them?
I need this for my trainer/rollers workouts, 20 min of steady work is too long and boring for me and my butt particularly, I want something shorter.
I need this for my trainer/rollers workouts, 20 min of steady work is too long and boring for me and my butt particularly, I want something shorter.