Master the bicycle crunch from start to finish, learn the mistakes most guys make, and add variations that target every part of your core.

If you've ever wondered why the giraffe has such a long neck, the answer seems clear: it lets them reach succulent leaves ...

Genetic tweaks allowed early humans to stand, balance and walk on two legs instead of moving on all fours like other primates, according to researchers.

A giraffe's long legs aren't just for height, they save energy by reducing how hard the heart works to pump blood upward ...

Two small changes in human DNA may have played a big role in helping our ancestors walk upright, researchers say.