A former pro football player and a Novato advocate for athlete marijuana use have teamed up to open a gym in San Francisco that they say will be one of the first in the world to allow members to smoke pot while working out.

Former running back Ricky Williams, who played for the Saints, Dolphins and Ravens, and Jim McAlpine, a snowboard company executive, said Power Plant Fitness also will offer edibles and topical gels for those who don’t like smoking the plant. They say using pot while exercising can help them focus or relax.

Members of the gym, which plans to open this year, will need a medical marijuana prescription to join, but that could change if California voters legalize recreational pot in November.

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