You are better off doing a 45-minute, moderate-intensity strength circuit three times per week than to do a two-hour, high-intensity workout six times a week, and then burning out in three weeks because it’s not sustainable. And remember that it takes time and consistency to build your body, but one workout can put you in a better mood. You leave it all in the gym: the annoying boss, the argument with your best friend, being stuck in traffic… It’s like you get to press reset.