Boxers and wrestlers alike throw bodily caution to the wind when it comes to making weight for an upcoming bout. Their preparation to make fighting weight tends to start months in advance, but sometimes it can stretch to right up until their weigh-in. In this clip from Glena, a Showtime documentary that debuted last Thursday and was featured at January’s Slamdance Film Festival, single mother and professional MMA fighter Glena Avila puts her body to the test in hopes of losing 1 pound in 20 minutes.

In the already controversial world of mixed martial arts (MMA) fighting cutting weight is an all too important part of an upcoming fight that involves a strict diet and rigorous workout routine. Fighters will tailor their diets to only include the essentials and will even go as far as to restrict the amount of water they consume in the days leading up to weigh-in. This strategy often includes drinking no water the day of the weigh-in before rehydrating after the weigh-in occurs.

In an attempt to lose a pound of water weight, Avila endures an intense training session with her coach while purposely dehydrating her body. Avila can be heard saying “I’m still so dizzy” as her trainer ensures her that she’ll be drinking water in 20 minutes. In the end, Glena “Heartless” Avila weighs in at her goal weight of 116 pounds and hopefully enjoyed a well-deserved (and needed) bottle of water. She is even hooked up to an IV of fluid at her hotel room to make sure her body is rehydrated.