Starfield Skills -> Physical Skills
Boxing is a skill in Starfield located in the Physical skill tree that improves unarmed attacks, causing them to do more damage and consume less oxygen.
Boxing Skill Description
Once considered a ‘sport of kings’, boxing is still practiced as a recreational competitive activity, but its combat applications can’t be denied.

Boxing Skill Ranks
Rank 1
Unarmed attacks do 25% more damage. 25% less O2 used when using a power attack.
Rank 2
Unarmed attacks do 50% more damage. 50% less O2 used when using a power attack.
Rank 3
Unarmed attacks do 75% more damage. While in a fight and unarmed, running consumes 30% less O2.
Rank 4
Unarmed attacks do 100% more damage and have a chance to knock down opponents.