Pseudo-Nerds who make the argument "exercise is like levelling up!" are not very good players. Not Meta.
After sleep, food, life bullshit, email, meetings, etc., you get at best 8 XP (hours) and more often just 4, per day to work on whatever skills you like.
If you spend 1-2 per day on PE, you're wasting 12.5-25% of your potential just to multiclass as Nerd/Jock, rather than those who spend all of their XP levelling Nerd skills.