exercise is a workout
slavery is where you get nothing in return of benefit or nothing of any valid equal worth of your effort
They get food as a reward. Just a joke you are very right about this.
I was only thinking work should stress the body, that is why recreational activities not stressing the body and despite being work, but you give me more insights into this as someone can also exercise oneself for good health reasons. Feeling cool in everything we do makes these recreational, but feeling it is work makes it stressful, that is why being at work makes us feel stresssed.