Every time you travel by plane, you're encouraged to be "selfish". Think about it: A flight attendant demonstrates instructs you to, in the case of an emergency, put your oxygen mask on first before helping children or other passengers. Hooking yourself up to life-giving oxygen may seem selfish...
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When you don't feel like [going all out](https://www.livestrong.com/slideshow/1010147-5-common-myths-highintensity-interval-training-hiit/) but don't want to phone in your workout, either, there's always [moderate-intensity cardio](https://www.livestrong.
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It's not abnormal to feel a little worn out after finishing a cardio workout. What you shouldn't feel is exhausted and completely drained.
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Cardio exercise is essential to any well-rounded fitness program, but strength and flexibility training make a big difference, too.
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The hamstring is a [group of three muscles](http://orthoinfo.aaos.org/topic.cfm?topic=a00408) that extends across the back of the thigh and moves the leg forward and backward.
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Ask yourself: Is there a lot we do to feel guilty about, or are we just beating ourselves up for no good reason?
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