When doing a high-intensity workout on a hydraulic machine, your body burns more sugar (carbs) for energy than when you lift weights, run, or bike at the same time.

Whether you do heavy or light weights before cycling, your body still burns the same amount of carbs during the bike ride.

Doing a 30-minute workout on a hydraulic machine with short bursts of all-out effort burns more calories than the same amount of time lifting weights, running on a treadmill, or riding a bike.

When endurance athletes eat a high-fat diet for 6 days, their bodies burn less carbs during a long bike ride compared to when they eat a high-carb diet — showing their metabolism switches to using more fat for fuel.

Even eating very little carbs—like just 30 grams a day—doesn’t make you weaker during weightlifting workouts, which means you might not need to eat a lot of carbs to lift heavy.

Lifting heavier weights doesn’t necessarily burn more sugar in your muscles—it might actually burn less, possibly because you can’t do as many reps.