A bigger board requires a bigger cushion, no? Yes. And a bigger board and a bigger cushion lead to bigger muscles, 'cause this combo makes for a truly challenging workout. You won't need to load up the barbell with a ton of weight, because the unstability of the big cushion puts a premium on perfect training technique. You can squats and presses and all kinds of fun stuff with far lighter weights than you would use on a stable surface, but trust us, it'll be plenty tough. Exercising on a moving platform recruits all your muscle groups to work together in perfect harmony and helps develop critical balance and terrific core strength.

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