I am not sure if I am doing step-ups correctly because my forearms feel more pressure/effort than my legs when doing the exercise.
Also I did 4x5 60 lb dumbbell and was heavily fatigued after them, forcing me to lift lighter weights on my subsequent lifts.
So, I suppose my questions are: what's good form for a step-up?
Also, the program involves leg curls however I'm not sure that there a very efficient exercise. Should I replace leg curls?