Jason Derulo's trainer on the secrets to rippling abs and a dream body

The celebrity trainer behind , and 's fitness regimes has revealed the secrets to their enviable physiques.

Noah Neiman, who created celebrity boxing hub 'Rumble', has spent almost two decades working with high-profile names.

Rumble is a 45-minute, 10-round, full-body cardio and strength workout crafted around specially designed teardrop-style boxing bags which are filled with water.

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