Widely regarded as one of the best bodybuilders of all time , Wheelers newest self-imposed fitness challenge is getting into the best shape possible by his 55 birthday on August 23. To make that goal happen, Wheeler has been hitting the gym daily, showing fans how he has adapted his fitness routine in the last several months to fit life as an amputee.

One video posted to Instagram on June 28 shows Wheeler working out on a leg press, impressively pressing weight with his left leg and prosthetic right leg.

I will not be denied, Wheeler captioned the video. Lets go.

Another recently posted video shows Wheeler using an elliptical, slowly and steadily moving at a constant fluid pace.

View this post on Instagram Learn to except what you cant change and change what you cant except . Im trying A post shared by IFBB LEGEND FLEX WHEELER (@officialflexwheeler) on Jun 26, 2020 at 5:48pm PDT

In October 2019, Wheeler had part of his right leg amputated as a result of a long-standing health issue. In a public statement at the time, Wheeler said the decision to amputate part of his right leg was due to escalating circulation difficulties in my right leg that had become life threatening.

After the procedure, Wheeler explained that he knew amputation could be a possibility for a while, but was hopeful to save his right leg through medication and surgeries. However, the leg had become incredibly painful, impacting his ability to walk let alone exercise.

I never walked this far of a distance before [the surgery] because the pain was just so great, Wheeler says in one recent video after taking a mere 10 steps on his prosthetic leg.

Along with being an International Federation of BodyBuilding & Fitness Hall Of Famer , Wheeler was the runner-up in Mr. Olympia in 1993, 1998 and 1999, and is is a four-time Arnold Classic winner.