Hunter Hobbs took a picture every day for three months, during which time he dedicated himself to the gym and was strict with his diet.
He then put the pictures together as a time-lapse video, creating a striking watch.
Hobbs, from Norman, Oklahoma, lost 42 pounds whilst also gaining muscle over the three months.
He went to the gym five to six times a week, lifting weights and finishing each session with 20-30 minutes of light cardio.
“This was a little extreme but [you] still can make real progress with even a somewhat [less extreme] workout and diet schedule! ” he wrote on YouTube.
Hobbs, 24, admits that the challenge was an experiment designed “to see what would happen if I actually took the gym and my diet (super) serious for three months.”
The start of the challenge (Hunter Hobbs)