Freestyle - high elbow, catch, pull and push phase generates a significant forward thrust

Breaststroke - both arms simultaneous in circular motuon with a glide phase for propulsion

Butterfly kick - dolphin kick, legs in wave like motion enhancing propulsion

Freestyle/backstroke kick - alternating up/dowm flutter kcik contributing to propulsion and maintaining bodu position

Streamlining reducing drag

Rotation - effective body roll in free/back improves efficiency of arm stroke