Working out on the sand (Brian van der Brug / Los Angeles Times)
Quinn Crumbley and Lila Smadja stretch elastic bands while balancing on a surfboard-like device during a class at Sandbox Fitness in L.A.
Katie Seigel holds a yoga pose while leading a class at Sandbox Fitness.
Quinn Crumbley jumps out of the sand onto a surfboard during a class at Sandbox Fitness.
Lila Smadja, left, holds a pose.
Quinn Crumbley, left, and Lila Smadja, right, warm up at Sandbox Fitness.
Quinn Crumbley balances on surfboard during a class at Sandbox Fitness.
Katie Seigel, right, leads a Tidal Turbulence class -- TRX on a surfboard -- at Sandbox Fitness.
Pedestrians walking along Beverly Blvd. stop to watch the Sandbox Fitness class inside.
Lila Smadja, left, Natalya Speece, center, and Michelle Middleton work out with elastic bands during a class at Sandbox Fitness.
Jordan Mirakian holds his balance.
Lila Smadja balances on a surfboard during a class at Sandbox Fitness.
Quinn Crumbley, left, and Lila Smadja stretch elastic bands while balancing on surfboards during a class at Sandbox Fitness.
