exercising at home is done on the right side of graham's room, below the status book. it's only available up to physical fitness 20 though. i should have 0.32 uploaded here tomorrow with the fix (and other stuff), just getting some testing in today
Download it from here, it's essentially a new game but you can manually move your savefile (it's a file called something like "Save01.rvdata2" in your game folder). Just copy that over to the new install location, pitch the old game, and you're good to go.
New build should go up later today, i'm just still trying to fix an uncooperative bug.