, sees the star shirtless as he began his workout journey.
He said: "By Christmas but possibly even in the summer this is going to be shredded."
Gesturing to his sides, he added: This is going to be gone. The back fat is gone, the thighs are going to be skinny, my arms are going to be boom."
He was then shown running, jumping and throwing his arms about in the boxing ring before they revealed the transformation.
Posting a picture of a Sun article about Arg's weight loss, he was then shown looking dramatically thinner - but still working out.
The video, which was shared by James, 34, on his own social media last night, saw him going to work on a punchbag.
The inspirational Boxup video was captioned, in a nod to his former role on Towie: "THE ONLY WAY IS PROGRESSION ‼️
"Great to see @real_arg Speaking Into Existence On Being Motivated In Becoming Fit & Strong
"James Argent Has Dedicated The Last Year Into Dropping Down His Body Weight And Fat Levels."
Referring to the gastric surgery he had after hitting nearly 28st last year, it went on: "Alongside A Procedure He Went Through He Had To Put In The HardWork And Dedication Into Reaching Where He is Now."
It concluded: "And Guess whatt …..he is still going !!"
Fans were impressed, with viewers of the video hailing the transformation as "absolutely incredible".
Speaking about getting the gastric sleeve that has helped him to lose weight, Arg said: "I reached the heaviest I’ve ever been in the height of the pandemic.
"Doctors said I was dicing with death because I’ve got bad asthma and was morbidly obese, which was the worst possible combination if I was to catch Covid.
“I could have been a goner, so I just knew I had to do something.”
James Argent looks slimmer than ever after eleven stone weight loss as he trains at boxing gym