By using only punching you specialize and do extra damage

Ducking and Weavimg

Increase your AC by guarding ducking and weaving and being quick footed. Does not apply if you are wearing armor or using a shield.

Combo

By using combos you can do more damage or incapacity your opponent

1Ki point Do extra 1D6

1Ki point knock opponent down

1Ki point cause opponent extra damage to opponent causing them to have disadvantage on their next attack

Hardened knuckles

Doing extra damage +2 each strike

Centered body and mind

Spending ki to get extra bonus

1Ki point to get a bonus to AC by watching your opponents movements +2AC

2Ki point to gain advantage on all attacks for one round

3Ki points to knock out an opponent that is one size larger than you or anything(anyone) same size or smaller