I think jumping rope is even more boring than running + you can cheat by slowing down. I have seriously looked into "running properly" and have tried to run ba

I think jumping rope is even more boring than running + you can cheat by slowing down. I have seriously looked into "running properly" and have tried to run barefoot a lot (which forces you to not heel-strike etc...) but I'm in a cold climate and it physically impossible ot run barefoot in the winter, and I never managed to get used to pebbles! I keep my distance to about ~ 21 km / week max (typically less), which I am thinking is low enough not to do too much damage. All other form of sports you are talking about require me to go somewhere, etc... which burns a lot of time. I enjoy other sports (hiking, swimming, skiing to certain extent, used to sail and do martial arts, ice skating) when I can, but not as regularly, and I'll argue not enough, because of time constraint.