Mountain Gnome (5e Subrace)
From D&D Wiki
Mountain Gnomes are hardy and tough. Mountain Gnomes are naturally stronger than other gnome types, though they tend to be more barbaric in nature.
Ability Score Increase. Your Strength or Constitution score increase by 1.
Sturdy. Your hit point maximum increases by 1, and it increases by 1 every time you gain a level.
Wrestler. You have advantage on Strength (Athletics) checks that involve grappling.