Stand-up paddleboard yoga a marries Boulderites' love of the outdoors with yoga, their indoor passion. (Mark Leffingwell / Daily Camera)

Rocky Mountain Paddleboard, Boulder Reservoir, Boulder, lisafierer.com, rockymtnpaddleboard.com

Instructor: Lisa Fierer, of Boulder, who has been teaching yoga for more than seven years and had a background in white-water kayaking and competitive rowing. Fierer discovered stand-up paddleboard yoga a few years ago. The is the first full year Rocky Mountain Paddleboard has offered SUP Yoga regularly.

The response has been huge. Many classes sell out.

"In Boulder, we're such an adventure-driven community of athletes and outsdoorspeople, and the merging of yoga, which is typically done inside, and taking that onto the water outside is appealing," Fierer says.

What is the workout? A class that fuses stand-up paddleboarding with yoga.

First, we received instruction on land, learning about the board, paddle, various strokes and turns. Then we took our boards out on the reservoir and paddled to another area of the water. We "anchored" our boards by dropping a heavy bag attached to a rope and then did a slow yoga practice while balancing on the boards.

What's different? You're doing yoga postures on an unstable surface, so you have to really balance and focus.

Fierer says the board "highlights where our natural imbalances are, so we have to recruit our ability to center and stabilize, both mentally and physically."

And because it's on the water, your practice is affected by the wind, boats, slight waves, bugs, sunshine and the natural elements.

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Boulder workout: Stand-Up Paddleboard Yoga