These engage most heavily during the "finish" phase of the stroke to push the water back.

The upper body is the "engine" of the swimming stroke, concentrating development in the chest, back, and shoulders.

A strong core is the "transmission" that transfers power between the arms and legs.

Swimming involves nearly every major muscle group working in a synchronized "kinetic chain" to overcome water resistance. Propulsion is generated primarily through the upper body, while the core and legs provide essential stability and positioning. 🦾 Upper Body Propulsion

The rectus and transverse abdominis keep the body in a streamlined, horizontal position to reduce drag.

The chest muscles generate the power needed during the "catch" and initial pull phases.

Proper core engagement prevents the hips from sinking, which is a primary cause of slowed momentum. 🦵 Lower Body & Kick

These are the most critical muscles for pulling the arm through the water.