Calisthenics is the usual American spelling of callisthenics (British English often keeps the extra l). It means exercise you do with your own body: push-ups, sit-ups, squats, jumping jacks — strength and looseness without gym machines, and often without weights. The name was built from Greek for “beauty” and “strength,” so the old picture was graceful, strong movement, not only sweating.

"Calisthenics"Calisthenics"is the usual American spelling of callisthenics"是callisthenics常見的美式拼法"(British English often keeps the extra l)"（英式英文常常保留多的那個l）。"It means exercise you do with your own body"意思是用自己身體做的運動："push-ups, sit-ups, squats, jumping jacks"push-ups伏地挺身、sit-ups仰臥起坐、squats深蹲、jumping jacks開合跳——"strength and looseness without gym machines"不用健身器材就能練力量和柔軟度，"and often without weights"而且通常不用啞鈴之類的重量。"The name was built from Greek for “beauty” and “strength,”"這個字是從希臘文的「美」和「力量」組合出來的，"so the old picture was graceful, strong movement, not only sweating"所以原本的畫面是優雅又有力的動作，而不只是流汗而已。

Though actually, American schools and coaches also use it for a short warm-up of simple moves, which can sound rather official or a little old-fashioned; many younger people just say bodyweight training, or name the move. In parks you may also hear it for harder bar work (pull-ups, muscle-ups). So the word stretches from gentle PE to serious street workouts.

"Though actually, American schools and coaches also use it for a short warm-up of simple moves"不過事實上，美國學校和教練也會用這個字指一小段簡單動作的熱身，"which can sound rather official or a little old-fashioned"聽起來會有點官方或老派；"many younger people just say bodyweight training, or name the move"很多年輕人就直接說bodyweight training徒手重量訓練，或直接講動作的名稱。"In parks you may also hear it for harder bar work"在公園裡你也可能聽到它指更難的單槓動作"(pull-ups, muscle-ups)"（像pull-ups引體向上、muscle-ups撐體上槓）。"So the word stretches from gentle PE to serious street workouts"所以這個字的範圍，從輕鬆的體育課一路延伸到很硬派的街頭健身。

This one-l spelling is the one American books and apps will show you.

"This one-l spelling is the one American books and apps will show you"這個只有一個l的拼法，就是美國書籍和App裡會看到的那種。