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How to shorten your workouts effectively
Do an upper-body exercise followed by a lower-body exercise.
A superset is based on the idea of working one group of muscles and then immediately working another group of muscles. You can cut your workout time in half if you successfully incorporate supersets.
For example, you might start with push-ups and immediately do a set of squats. If you wanted to lead with lower-body exercises, you might start with lunges and move directly into shoulder presses.