I have an odd request that I believe only people who train in martial arts or boxing might be able to answer.
I climb the stairs in my highrise, going through either a jab or cross motion with each step. It's not a snappy jab/cross, it's more to condition the body, but it helps when shadow boxing.
To add weight to my stair climbing, mostly for the lower limbs, I wear a backpack. But the shoulder straps aggravate bursitis or tendonitis (not sure which) on the shoulders. You get old enough and you get those things. Even the cross strap that pulls the shoulder straps inward, away from the tip of the collar bone, doesn't help much.
Is there a commercially available weight harness for this purpose? It should be easy to hang up and air out, and it should consume little space when stored. And it should be able to carry an adjustable amount of weight (I'm guessing that the back is where the weight would be). The weights should be easy to tuck away.
I imagine that it might look a bit like an S&M contraption, but hopefully not. I don't need to attract attention going to the stairwell.