![T NATION on Twitter:](https://pbs.twimg.com/media/DiCFUJVXcAEqzoT.jpg)
T NATION on Twitter: "Strength, power, coordination, endurance... CrossFitters have more than most. Here's why they deserve the title "World's Fittest Athlete": https://t.co/9AZoxLjdlE… https://t.co/rfnacQxnH3"
![T NATION on Twitter: T NATION on Twitter:](https://pbs.twimg.com/media/Dn9OJwFXcAIC2il.jpg)
T NATION on Twitter: ""You have two main types of ACTN3. The X variant is better suited for endurance activities while the R variant is better suited for speed and power. "
![T NATION on Twitter: T NATION on Twitter:](https://pbs.twimg.com/media/DuZluuFXgAA_4sm.jpg)