The 27-year-old is targeting several races leading up to the 2016 Olympic marathon.
The 1500m specialist talks about his new sponsor and his newfound speed.
Cross-country racing brings a different set of challenges, but it's a rewarding style of running.
The 33-year-old is aiming for a sub-2:20 marathon clocking this fall.
Putting in the miles should allow you to finish an ultra, but mixing up your training will help you finish strong.
America's ultimate ultramarathoner hopes to keep his undefeated streak alive.
Recovery is just as important as going for a run, so be sure to include this in your workout routine.
Kastor and his wife Deena own the California club that boasts a strong professional lineup.
If you're a beginner trying to tackle your first 5K, reaching the finish line is achievable with the right preparation and focus.