Imagine Dragons' Dan Reynolds Completely Transformed His Body in Just Months

The singer was battling two autoimmune diseases.

Imagine Dragons In Concert - Clarkston, Michigan
Getty ImagesScott Legato

It's not easy to overhaul your exercise routine, diet, and overall lifestyle, but Dan Reynolds has done just that.

The Imagine Dragons singer recently posted a series of tweets and Instagram photos sharing how he has treated his autoimmune disease and is now living a healthier life.

In one Instagram photo of himself, the singer thanked his trainer, Ben Feinberg. He wrote, "I’ve spent a decade fighting an auto immune disease that inflamed all my joints (AS). I now live pain free, am in full remission and am the healthiest I’ve ever been. I owe it to this man @thor345622. Correct diet, vitamins and exercise. I’ll share it all with you soon. It’s been life changing for me."

A post shared by Daniel Coulter Reynolds (@danreynolds) on

Reynolds first opened up about his battle with ankylosing spondylitis, or A.S., during an Imagine Dragons concert in November 2015. The autoimmune disease is a type of arthritis that causes severe inflammation of joints in the spine, pelvis, and hips. According to the , it can cause some of the vertebrae in the spine to fuse.

Reynolds also has ulcerative colitis, a chronic disease of the large intestine.

As reports, Reynolds later posted a before and after picture of himself on Instagram. "Sorry for the corny exercise post but truly changed my life and healed years of pain."

A post shared by Daniel Coulter Reynolds (@danreynolds) on

The singer has been working on his health for a while. In 2017, he spoke to People about how he was dealing with A.S.

"It really has been a very healthy year for me. But it didn’t come without work, a lot of physical and mental work," he told the magazine. "A.S. requires you to live a more disciplined life, and once I found the right balance of that I’ve really been great for a year."

While Reynolds didn't share exactly what he did to achieve such amazing results, the Spondylitis Association of America recommends daily exercise and a balanced diet with plenty of vegetables, fruits, and whole grains to alleviate symptoms.