41-year-old Oregonian Cheryl Brost proves that age really is just a number, as she routinely competes against—and beats—women half her age. Brost came in seventh in the 2011 Reebok CrossFit Games and is aiming to better her position this year.
Her best tip? Watch your nutrition. "I don't weigh and measure my food for every meal, but I do measure on a regular basis so I know exactly what 2 cups of veggies or 4oz of protein looks like."