 And the new thing is that it's not just aerobic exercise. Aerobic exercise was popularized in the 1980s, 1990s, and so on. And, you know, we had folks like Jim Fix suggesting that we put on our running shoes and get out there and jog. Alternatively, use the elliptical machine, walk. That's aerobic exercise. But resistance exercise involves pushing against weight, either your own body weight or free weights or machines, etc.