Marketic It's no definitive masterpiece but it's damn close.

Beystiman It's fun, it's light, [but] it has a hard time when its tries to get heavy.

AnhartLinkin This story has more twists and turns than a second-rate soap opera.

Humaira Grant It’s not bad or unwatchable but despite the amplitude of the spectacle, the end result is underwhelming.

crueltyfreeeating I wouldn't have my daughter watch this documentary. Nikki's consumption of sugared soft drinks, bacon, white bread processed meat sandwiches in some scenes while talking about kids who are fat in other scenes bothered me. Perhaps you can eat what you want when you run. You can. But should you? Her diet is no inspiration. And no one should exercise to the level that Nikki does. There is a whole lot of unhealthy in this documentary including emotional breakdowns that don't help her cause. She needs a whole team to deliver her junk food diet to her as well as water and bandages and etc. while she races. Ladies . . . we can do better. No amount of cool music and slow motion running shots can save this documentary from disaster.