this trainer likely being put ON HOLD soon anyways.
If you open your inventory menu and click on status it will show you your overall health. you can click on the arms or the legs to give you an overall status of that limb and what it requires to be treated.
Wounded requires treatment and only takes 3 hours while severly wounded treatment requires 5 hours.
The two limbs that can be damaged are the arms and the legs. sometimes they may only require self healing while other times they may require treatment either with a bandage (unlimited bandages option) or other medical items that you find.