I've been pretty consistent about rock climbing and martial arts for multiple short periods in my life, and it is always glorious. Currently I am climbing (bouldering, which has a simplicty top-roping does not) multiple times a week, and weightlifting and getting cardio exercise as well for a few months. I am probably in the best cardio shape of my life (which is pretty mediocre!) and it is pretty great. I've got a group I go with, which is good for motivation.