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6. Doing cardio first, then strength training

The order of your workout depends on your personal goal.

If you want to lose weight or improve strength, the American Council on Exercise recommends doing strength training before your cardio session. If, however, your goal is to build up your endurance for a marathon or triathlon, they recommend cardio first. This comes down to using your energy in the most efficient way possible.

Fried always sees the cardio-first mistake with her new clients who want to build muscle.

"When I typically talk to people about what their workouts look like it's something like 45 minutes of cardio, and then they'll do 15 minutes of weights," Fried said.

"It should really be reversed [...] because you want the most possible energy when you're lifting heavy weights."

[Photo via @victoriasport]

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