What is considered to be the oldest form of exercise?

Most likely walking, since ancient peoples, being rather nomadic (hunting/gathering to survive) spent a lot of time walking. The below article doesn't specifically say say walking is the oldest form of exercise, but indicates those ancient hunter-gatherers were active people due to their method of finding food.

Well, not the gym that’s for sure? X

Wanking

walking, a short distance-- then increase daily-- then gradually increase then starting running a short distance then increase daily-- then go inside to the weight room start out with light weights and increase daily.

The military (of any country) would have introduced some form of calisthenics, push ups, pull ups, etc. Before that, nobody needed to "do exercise." Life was more work than you would have wanted to do.

Probably having a first class screw, after chasing over half the bloody landscape in pursuit of it.

Running

Walking

Probably walking

I suspect Tai chi might be in with a shout - and I guess there can be no definitive answer; but I'd be interested to see what people think.

I'm thinking of highly-preserved forms, like specific martial arts or even styles of dance (but not 'dance' itself, for example).