The oldest fitness is actually lifting a tripod. Lift the tripod over your head through various skills and strength. The heavier the weight, the more awesome it is.

Secondly, the more modern fitness method is to lift a stone shoulder, but it is about to decline.

Then it became popular to lift weights or something.

But going to the gym is more standardized, which can better isolate training and exercise muscles.

In fact, if you really want to keep fit, just one wall can be strong. You can watch the prisoner's fitness.