Photo: Brian Doben

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11. Paddleboard Yoga
If you're a lotus-pose veteran, here's a way to shake up your yoga practice. With SUP yoga, you can try out your moves while floating on a stand-up paddleboard; the lack of solid footing makes your core work twice as hard. And when you get sick of all that wobbling, you can abandon downward-facing dog for dog paddling. Consult bogaboards.com or paddleintofitness.com for places to get on board.