Tabitha McMahon straps on her helmet as she prepares for one of the group's training rides. Amanda Sloane/CNN
Miller prepares for the team's morning bike ride. Amanda Sloane/CNN
Gupta, right, and Timme lead the way. Amanda Sloane/CNN
It's group photo time for the "6-Pack" and their coaches and fellow Fit Nation triathletes. Amanda Sloane/CNN
The Fit Nation team heads out for a run along one of Clermont's clay trails. Amanda Sloane/CNN
Timme keeps a steady pace during the 5.3-mile run. Amanda Sloane/CNN
Cleveland tackles the hills with ease. Amanda Sloane/CNN
McMahon slows as the trail rounds a bend. Amanda Sloane/CNN
Wow, we're impressed. The "6-Pack" is in serious training mode. Amanda Sloane/CNN
The team celebrates after completing a run in the Florida heat. Amanda Sloane/CNN
Members of the "6-Pack" practice racing into the water before their first ocean swim. Amanda Sloane/CNN
Miller is amused as she struggles to put on her wetsuit for the first time. Amanda Sloane/CNN
Cleveland, right, helps Mantooth stretch out his suit. Amanda Sloane/CNN
Timme hesitates as she walks into the ocean for the first time. Amanda Sloane/CNN
Gupta takes a short break during a swim workout. Amanda Sloane/CNN
Cleveland and Mogle practice the dead man's float. Amanda Sloane/CNN
Using flippers during practice helps team members strengthen their kick and ankle flexibility. Amanda Sloane/CNN
Coach April Burkey instructs the team on proper stroke techniques. Amanda Sloane/CNN
A underwater view of the team during training. Amanda Sloane/CNN
Cleveland powers through the water. Amanda Sloane/CNN
The Fit Nation team tackles a long bike ride during training. Amanda Sloane/CNN
Rajesh Durbal joins the Fit Nation team on its ride. Durbal was the first triple amputee to compete in the Ironman World Championship. Amanda Sloane/CNN
Mogle gets a quick roadside checkup. Amanda Sloane/CNN
Karl Riecken, an exercise physiologist at the National Training Center in Clermont, checks Cleveland's running form. Amanda Sloane/CNN
Timme stretches her hip flexor at the National Training Center. Amanda Sloane/CNN
Mantooth has his swim kick analyzed at the National Training Center. Amanda Sloane/CNN
Burkey makes this look easy, doesn't she? Amanda Sloane/CNN
Castelli, right, and McMahon share a lane. Amanda Sloane/CNN
Hydration is key for the Fit Nation athletes. They carry water on them at all times, even while swimming. Amanda Sloane/CNN
Timme adjusts her goggles before jumping into the pool at the National Training Center. Amanda Sloane/CNN