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Having a camera-ready physique that's trimmed and bulked in all the right places isn't always enough. You can look like a fitness model, but if you want the strength of a defensive lineman, the speed of an elite sprinter, and the power of an Olympic weightlifter you need to test and push your boundaries.
The following pieces highlight a facet of human performance—strength, power, agility, conditioning, endurance, and the like—that's entirely trainable and adaptable (to a certain extent).
Work your way through some of the greatest feats of fitness. Mark your baseline, track your progress, and see how far you can push your limits.