Physical is an attack supertype in the Super Smash Bros. series that encompasses hits with a variety of melee attacks, including punches, kicks, headbutts, bites, etc.. The Physical supertype is subdivided into several subtypes: Arm, Foot, Body, Bite, Head, Tail.
Physical attacks are boosted only by their respective stickers (Arm Attack for Arm, Bite Attack for Bite, etc.) in Super Smash Bros. Brawl's The Subspace Emissary. In Super Smash Bros. Ultimate Physical attacks are boosted by the support spirit skill Physical Attack ↑ as well as certain Spirit Battle conditions.
Arm attacks, which is a subtype of Physical attacks and itself includes Hand and Elbow attacks, are boosted by the primary spirit traits Fist Attack ↑ in Super Smash Bros. Ultimate. Leg attacks are similar, including the Foot and Knee attacks, and are boosted by Foot Attack ↑ in Ultimate.