Steve Maxwell(remember Steve Maxwell?) has a great post today on the 6 count burpee:
One of the most grueling and gut checking exercises I can think of is the 6-Count Burpee, known in the military as the 6-Count Body Builder. It's a tremendous, results-producing, body fat burning exercise which exploits every body muscle from head to toe and drives the cardio system like few things else. Like other whole-body exercises of its kind, it instigates a considerable HGH surge, similar to sprint protocols. Something separating the Burpee is the athleticism and coordination involved: there's a level change and a strong core component, mixed with upper body pushing then followed by an explosive leap from the low squat position. Regularly working Burpees into your routine develops athletic attributes, such as agility and coordination, not typically covered in fitness programs.