Update Notes:
- Rescaled experience required to level up.
- Player Potential and Health scale with level.
- Reduced cooldown on combat attacks (jab, hook, uppercut).
- Redefined experience gained from AI combat practice, sparring with other players, and training based on level.
- Reduced chance of blocking AI attacks in practice.
- Added a new system to improve respiratory capacity in combat.
- Rescaled difficulty of AI combat.
- Combat practice and sparring require a minimum player level.