Though the burpee has become popular, you've probably never seen this option. It'll give you a far better upper-body blast than the traditional hop-in, hop-back burpee.
Burpee Walkout
Keep your legs as straight as possible on the walkout and the walk-back, and alternate between arms.
Dan John's been dragging his calloused butt across Terra Firma for a relatively long time, but he only recently realized he'd been wasting a lot of time on assistance exercises and aerobics.