"Thrill Of The Fight", "Holopoint", "GORN" or similar games are a lot of fun and are at least a moderate workout. I've literally just finished a half-hour session of GORN, I'm fairly sweaty, and I wasn't bored once.
(I also recommend similar things in IRL with Actual People, but I'm aware that those tend to be both more intimidating and harder to fit into a pre-set schedule.)