Suspension training isn't just a passing workout craze — it's here to stay, and for good reason. According to Shape mag, the TRX Suspension Trainer was developed by Navy SEALS and uses gravity and your own weight to sculpt your body from every angle. Plus, because the TRX band is portable (you can attach it to a door, a tree, or basically anything), you can put in a workout anywhere. Watch the video above for five challenging moves that will tone your core and improve your endurance. 

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