Breaststroke-thigh
Freestyle and backstroke are whipping the thighs up and down, and only breaststroke is a pedal clip. The former can make legs longer, while the latter uses quadriceps more in breaststroke, so it is very effective to strengthen leg strength.
Butterfly stroke-chest and waist and abdomen
In butterfly stroke, the arm strokes inward, similar to expanding the chest. Exert more force on pectoralis major, latissimus dorsi and shoulders (the front, middle and back three bundles of deltoid, especially the back bundle), and the exercise effect is also the best.
Freestyle and backstroke rely on the thigh to drive the calf to fetch water, while butterfly relies on the waist and abdomen to drive the whole lower limb of the leg to make dolphin legs, so the strength and coordination of the waist and abdomen are very demanding. Butterfly is an immediate exercise for rectus abdominis, so butterfly swimmers often have strong and beautiful abdominal muscles.
Freestyle-biceps and triceps
In freestyle, although kicking water in the legs provides great power, it requires higher upper arms. The biceps brachii and triceps brachii of the upper arm provide direct strength for progress, so freestyle can effectively exercise the muscles of the arm (arm). Every time he swims/kloc-0.000 m freestyle, Yu Jun's arm even aches, so he needs to be afraid of massage to relax.
Backstroke-latissimus dorsi
When backstroke, latissimus dorsi will exert more force and stretch the back muscles. In addition, when backstroke, you need to lift your hips and slide, which is also an exercise for your hips.