LES MILLS CLASSES BODYPUMP ™. BODYPUMP™, the original LES MILLS™ barbell class, will sculpt, tone and strengthen your entire body, fast!. Great bodies aren't born, they are transformed, using the proven BODYPUMP™ formula: THE REP EFFECT™ a breakthrough in resistance workout training. Focusing on low weight loads and high repetition movements, you'll burn fat, gain strength and ...