The XMark XM-4434 Power Tower is the superb ways to boost your leading physical body as well as core toughness. Just like squats for the lowered physical body, pull-ups are amongst the best exercises to enhance general toughness and muscular tissue tone. With the XMark Power Tower you can do a selection of exercises to target these core locations http://www.youtube.com/watch?v=4JXJJZQg8tw http://vid.me/gkWh