>>532055550
Stamina determines your honse's max HP at the paddock. HP depletes as your honse runs.
>uphills, restless, pace up, and the last spurt increase HP consumption
>downhills and pace down decrease HP consumption
Stam Recovery skills restore a flat percentage HP on activation. Swinging Maestro is a Gold Recovery skill and restores 3.6x more HP than their white counterparts, which is why it's so desirable for long distance honses.

Please notice Stamina != HP. Stamina is the stat, and HP is calculated based on Stamina.