Cryotherapy Session
You could just get them a gift card to a spa or for a massage, but why not go for a more interesting experience like cryotherapy? It’s basically a box you get into to get blasted by ridiculously cold air for a short period of time. Advocates say that the treatment rejuvenates the body and helps repair tissue damage. If your town doesn't have a cryotherapy place yet you could try a bathtub full of ice and a big fan.