Need a quick sweat session that doesn’t eat your day? This leap-year HIIT routine uses short bursts of bodyweight work to crank up intensity almost anywhere.

Pairing lower-body and upper-body movements with short rest periods can create a powerful body-composition workout that builds muscle while driving up training density.

Circuit training can be more than random sweat work when the goal is fat loss without sacrificing muscle. Modern Muscle Moulding blends strength and conditioning for efficient body-composition training.

Bad weather is no excuse for a soft workout. Run through this barbell complex to combine strength, conditioning, and fat-loss work with one loaded bar.