Running is probably the most functional movement you can do. If you’re 80 years old and your house is on fire and you’re unable to sprint down the stairs, you’re in trouble. A scaled version of running is simply walking. And if you lose your ability to walk, your life will certainly suffer. Although you’ll learn when you train with us that you can get a pretty good cardiovascular endurance workout with a barbell or a medicine ball, there’s no denying that running builds cardiovascular cardiorespiratory endurance and stamina. Rowing, too, is a great way to build cardiovascular endurance and stamina, and is also useful for power endurance training. We use indoor rowing machines called ergometers. On top of running and rowing, other grew tools to improve endurance are skipping and double unders, cycling and swimming, among others.