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We're bringing back the five-minute stretch break!
Being under-recovered is just as bad as being under-trained; being under-recovered leads to exhaustion, lethargy, muscle aches, trigger points, and stiffness, and left long enough it will lead to injury. Recovery allows the body to become stronger, leaner, and generally healthier; it puts that extra little energetic pep in one's step. It is not something "extra" you do when time allows.