A little-noticed part of President Obama’s Affordable Care Act channels some $12.5 billion into a vaguely defined “Prevention and Public Health Fund” over the next decade—and some of that money is going for everything from massage therapists who offer “calming techniques,” to groups advocating higher state and local taxes on tobacco and soda, and stricter zoning restrictions on fast-food restaurants.

The program, which is run by the U.S. Department of Health and Human Services (HHS), has raised alarms among congressional critics, who call it a “slush fund,” because the department can spend the money as it sees fit and without going through the congressional appropriations process. The sums involved are vast. By 2022, the department will be able to spend $2 billion per year at its sole discretion. In perpetuity.

What makes the Prevention and Public Health Fund controversial is its multibillion-dollar size, its unending nature (the fund never expires), and its vague spending mandate: any program designed “to improve health and help restrain the rate of, growth” of health-care costs. That can include anything from “pickleball” (a racquet sport) in Carteret County, N.C. to Zumba (a dance fitness program), kayaking and kickboxing in Waco, TX.

“It’s totally crazy to give the executive branch $2 billion a year ad infinitum to spend as they wish,” said budget expert Jim Capretta of the conservative Ethics and Public Policy Center. “Congress has the power of the purse, the purpose of which is to insure that the Executive branch is using taxpayer resources as Congress specified.”