The reverse hyper is one of the best pieces of equipment around for strengthening the posterior chain: the hamstrings, glutes and lower back.
Westside's Louie Simmons invented it, so you'll see it a lot in hardcore powerlifting gyms. And today many CrossFit boxes are adding them. There are several ways to use the machine – unilaterally, bilaterally, swinging or strict – but in the video here we'll just go over the basic function.
Tim's "Ah-Ha" moments have to do with the superiority of supersets over combination exercises, working abs first, the proper way to gain weight, debunking the stability ball myth, and a nifty little trick to make sure you're squatting low enough.