Celeb: Bob Harper, the tough, tatted-ed up trainer who whips contestants into shape on NBC’s “The Biggest Loser.” On Friday, he wore a T-shirt that showed off Popeye-esque biceps and, endearingly, dark-rimmed glasses (see! he does have a physical flaw!).

Cause: A proposal that the D.C. Council is considering that would require trainers to be certified by a board. CrossFit founder and CEO Greg Glassman says that gyms are already suffering because of the “yoga tax” and that the new scheme would make memberships more expensive, drive gyms out of business  and, ultimately, deter people from working out.

Scene: Harper played bulging-wingman to Glassman at a rally of dozens of CrossFitters at District CrossFit in the shadow of Nats Park. Amid racks of medicine balls, weights, and equipment that could double as torture equipment (maybe it does?), a crowd with enough washboard abs on display to clean the city’s laundry gathered to hang on Glassman and Harper’s every word.

Sound bite: “We’re all CrossFitters, and when one of us is in trouble, we’re all in trouble,” Harper said, explaining his interest in the issue. “People say CrossFit is a cult and that we’re all addicts, but with results like this at a time when obesity is soaring — hey, this is an addiction I want to be a part of. We want to make it easier, not harder, to be part of it.”