: ***TAG A WORKOUT PARTNER AND GET FIT***. Here myself and @ pt_stafa are doing #expkosives on the #bosu ball. We start in a #lowplank position on the bosu and explode up into #highplank #pushup position and repeat until your arms crack or you run out of breath LOL just kidding, but the magic number is 20. Your Core is the meat of the form, so keep it tight. Hence why you hear the slamming into the ball, it's what makes this move happen. Have fun!!