When you lift weights, your body uses stored energy (creatine phosphate) and fat for fuel—not just sugar.

Doing a tough weight workout before jogging or cycling helps your body burn more fat while you're doing the cardio.

After a hard weight workout, your body burns more total calories during your next cardio session than if you did light weights or no weights first.

When strong athletes lift super heavy weights until they can't do another rep, the energy stores in their muscles—called ATP and creatine phosphate—get used up fast, dropping by a lot in just a few seconds.

To know how many calories you burn during a weightlifting session, you have to measure your breathing for at least 90 minutes after you finish—most of the burn happens after you’re done lifting.

Resistance training is energetically inefficient in terms of total caloric expenditure due to predominant eccentric muscle actions and prolonged inter-set rest periods.