good advice andre your hands are your livelyhood and nothing is worth risking them, i can say from experience that my left hand is permanently tender and always niggling at my workouts, however i have had lots of bad practice in my time i remember as a kid the first heavybag i got my parents wouldnt let me hang it so i just propped it in the corner and would slug away at it right there in my room, when i think about it now it makes my wrist whimper heh.