Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to shorten your workouts effectively [title] Do an upper-body exercise followed by a lower-body exercise. [step] 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.

Ending1: [substeps] 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. Ending2: It's important to note that different exercises are programmed differently. Then it's too late to skip through the exercises and still be able to finish those exercises before you start trying them again. Ending3: You will get a good idea of which muscle groups will be most worked and which ones will work the least. [substeps] Try pezongying or doing a turbocharger. Ending4: [substeps] Squats: lie on your back with your palms on the floor in front of you. Lift your right leg straight up slightly off the ground, keeping your foot flat on the floor.

Answer format: ending1/ending2/ending3/ending4