Video highlights

MrBeast laid out the terms: if Sara and Tre lose 150 pounds before their wedding day, they win $250,000.

The wedding is the first time anyone in their family will see them, which MrBeast framed as part of the stakes.

A red circle surrounds the couple's new home. If either of them crosses that line before losing 150 pounds, the video ends and they receive nothing.

MrBeast described the goal as the BIGGEST transformation on YouTube.

The couple then entered the gym MrBeast had built for them, a space he described as containing everything they needed.

Sara's experiences with very fit people have always involved judgment.

Family members made her feel judged, and she heard many comments about her weight.

She never felt uncomfortable with the trainers.

Before the challenge, Sara had never lifted more than a five-pound dumbbell, and the idea of deadlifting the heavy weight terrified her.

By day 35 her morale had dropped, and her workouts got worse as her mood declined. She felt awful and broke down in tears.

She had been doing this for 39 days after spending 27 years not doing any of it.

MrBeast compared the couple's starting clothing sizes, a 4XL and a 3XL, with their current sizes, a 3XL and a 2XL.

If the clothes fit, they had lost an entire size so far.

Tre's jacket was a little loose in places, but that was fine, and Sara's clothes also looked baggy on her.

By the wedding, they could drop two or three more sizes, MrBeast suggested, and the family reaction would be dramatic.

MrBeast presented blood work from Function Health, starting with Sara's insulin, which decreased by 82%.

Tre's insulin decreased by 83%. These changes add years to their lifespans, according to MrBeast.

Still, MrBeast added, there is room for improvement.

The numbers were presented to Sara as the tangible evidence she needed to keep going.

On day 90, the couple stepped on the scale and reported that they were down 107 pounds.

Hawaii was the honeymoon prize, funded by the Polynesian Cultural Center, after the couple finished the challenge.

The reward is a honeymoon to Hawaii, provided through the Polynesian Cultural Center.

The offer was that if they doubled the target to 300 laps, Sara would also receive a brand-new car.

Near the end of the pulling, Sara called the challenge the dumbest thing she had ever done.

Sara had never felt this level of pain before, and she could not do this anymore.

Tre encouraged her, telling her she was doing amazing and that they had this together.

They finished their final laps and received both cars.

The couple had lost 130 pounds and needed 20 more to win the money.

MrBeast revealed five briefcases, each containing a fitness challenge tied to $25,000.

Opening a briefcase means accepting its challenge; declining means it is thrown away and the next one is opened.

The first briefcase held a ten pull-up challenge, which the couple declined.

Her motivation had plummeted over the past two days, and she was bored, Sara said.

Both missed each other, and time crawled while they were apart.

They could see each other in the gyms but could not hear each other.

MrBeast reminded them why they were there, and they recommitted to the challenge with a renewed determination.

Sara chose a wedding dress with her mother's help, and Tre picked a tux with his father.

With the wedding and an extra $50K on the line, they worked harder than before in the final 10 days.

Her arms began to shake partway through, but she finished the full minute.

The crowd celebrated, and the prize money was thrown into a pile.

Tre returned to the scene to celebrate with her.

Five months before the final weigh-in, the couple's letters laid bare deep self-hatred, and they read those lines aloud on their last workout.

In Sara's letter she wrote that her mental health was severely impacted by her lifestyle and that she hated herself most of the time.

One letter confessed that the writer could not recall the last time they looked in the mirror without disgust.

During the ceremony Sara told Tre she had watched him become a new man, and she promised to stand by him every day.

Tre credited Sara as the rock who carried him through every challenge and kept him grounded.

Then the officiant instructed, 'Tre, you may kiss your bride.'