A speed bag is a small, air-filled bag used in boxing and combat sports to improve hand speed, coordination, and rhythm. It is attached to a swivel on a sturdy platform, allowing it to rebound quickly when struck. The rapid movement of the bag helps athletes develop reflexes, timing, and endurance while also enhancing shoulder strength and cardiovascular fitness. Speed bags are typically made of leather or synthetic materials and require consistent, rhythmic punches to maintain control and accuracy during training.

英語での「speed bag」の定義と意味

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