Martials in Level Up: Advanced 5th Edition receive an Exertion Pool to fuel some of their abilities and class features. The number of exertion points you can receive is twice your proficiency bonus. The A5e Fighter at key levels can increase the size of the Exertion pool by an extra point. They also can reduce the Exertion point cost of a single maneuver at key levels (all maneuvers in A5e come with an Exertion point cost).All martials (including fighter) having a pool of 'stamina points' which can be used to fuel abilities and class features.
Which is why I think the Fighter in Level Up: Advanced 5th Edition is significantly better.Hot take: remove the Fighter class. Seriously, it's identity is "fighter" when everyone can fight pretty much equally in 5e. There's really very little distinct or flavorful about them compared to other classes; Paladins have magic and auras and lay on hands and big boom smites. Rangers have spells and hunter's mark and options the fighter can only dream of (I mean, the lowly Hunter gets Whirlwind Attack, something the Fighter can never have?). The Barbarian has savage attacking and RAGE!
All of the Fighter's flavor comes from subclasses....and some of them even fail to be all that interesting. You can't be a weapon master, because anyone with proficiency is just as good as you. There is no weapon specialization, really. Heck, with the loss of GWM, Fighter damage is going to fall into the basement.
So yeah. Replace the Fighter with flavorful classes. Give us Myrmidons, Gladiators, Swordsages, and Warlords!
Make the fighter more like its 4e incarnation.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.