Standing up THE CLIMB is too fatiguing standing up on hardest mode (grip sensitive stamina drain). Obviously BEAT SABER if you put more effort into it. However, it's THE THRILL OF THE FIGHT (also in Early Access) that will totally beat you up! We need more - an actual P.E. Trainer. Tried the Porn thread?
Creed Boxing is my fav for this type of thing. You can go between single player championship mode and multiplayer. Fighting against other humans is the ultimate competitive workout in VR so far. imo