Wait. WAIT.
There are other physical activities I can do with my time?
Thus far, I've only really dabbled with running a few times a month in the dead of winter, and last year I was very much into muay Thai. I was surprised to find how quickly a burnout session of body kicks could drive my heart rate up. I miss it a lot, and I think projecting my frustrations on to a heavy bag helped maintain my last shreds of sanity.