Specifically, watching YouTube Pilate videos.
I call it vicarious exercise.
Latin vicarius, from vicis change, alternation, stead — more at week
1 a: serving instead of someone or something else b: that has been delegated
2: performed or suffered by one person as a substitute for another or to the benefit or advantage of another : substitutionary
3: experienced or realized through imaginative or sympathetic participation in the experience of another
4: occurring in an unexpected or abnormal part of the body instead of the usual one
Hey, I could start a new trend in exercising!