Good because generally these workouts (speed + reps) push your endurance and you get a good hit of a workout. Bad because if your form isn't correct, or if your teacher isn't watching/teaching you form correctly, speed + reps can very, very easily tweak joints and ligaments and cause badness. (Citation: me, with my crap rotator cuffs and stupid hips, lolz.)
no subject
Good because generally these workouts (speed + reps) push your endurance and you get a good hit of a workout. Bad because if your form isn't correct, or if your teacher isn't watching/teaching you form correctly, speed + reps can very, very easily tweak joints and ligaments and cause badness. (Citation: me, with my crap rotator cuffs and stupid hips, lolz.)
*fails*