In the years following his near-fatal 2007 methadone overdose, Eminem underwent one of the most physically and psychologically extreme transformations of his entire career. While fans focused on the rapper’s eventual musical comeback, those closest to him witnessed a far more brutal private battle unfolding behind the scenes — one built around obsession, exhaustion, and survival.

According to longtime friend and collaborator Royce da 5’9”, Eminem did not approach sobriety casually. After years of dependency on prescription pills severely damaged both his body and mental state, the Detroit rapper reportedly replaced addiction with an almost punishing commitment to physical discipline.

Royce explained that Eminem became consumed by treadmill running during his recovery process, eventually pushing himself to astonishing limits. At the height of the regimen, the rapper was reportedly running an incredible 17 miles every single day.

The physical results were dramatic.

Eminem shed roughly 81 pounds during the transformation, dropping to an extremely lean 149-pound frame after previously appearing bloated and physically drained during the darkest period of his addiction struggles. Friends reportedly watched his entire appearance change as the relentless cardio stripped away the physical toll narcotics had taken on his body.

But according to Royce, the obsession went far beyond simple weight loss.

Following the overdose, Eminem faced a terrifying reality: his brain no longer knew how to function normally without chemical assistance. Years of dependency had disrupted his sleep patterns, energy levels, emotional regulation, and mental stability. Royce explained that running became the only form of exhaustion powerful enough to quiet his mind naturally.

Rather than relying on sleeping pills or replacement substances, Eminem reportedly pushed himself to complete physical collapse through cardio. The treadmill became both therapy and punishment — a daily ritual intense enough to help his traumatized nervous system slowly relearn basic biological rhythms.

The process was grueling.

At times, Eminem’s exercise addiction reportedly became nearly as consuming as the substance abuse it replaced. He would spend hours running while listening to music, counting calories obsessively, and maintaining rigid control over his body as he fought to stay sober. The structure gave him something he desperately needed during recovery: routine, discipline, and a sense of control after years of chaos.

Fans later noticed the dramatic difference during the Relapse era and beyond. The puffiness and exhaustion visible during the peak of his addiction years gradually disappeared, replaced by a noticeably leaner, sharper, and healthier appearance. His face looked thinner, his energy returned, and his performances regained the intensity that had defined his early career.

Royce da 5’9” emphasized that the transformation was not driven by vanity or celebrity image concerns. It was survival. Eminem reportedly understood that inactivity left space for dangerous thoughts and cravings to return. Running became his way of physically outracing the addiction that nearly killed him.

The overdose itself had been catastrophic. Eminem later admitted he consumed such massive quantities of methadone that doctors told him he was dangerously close to dying. At one point, the damage to his body became so severe that even simple recovery tasks felt overwhelming. Learning how to sleep, eat, focus, and function without pills required rebuilding himself almost from scratch.

Exercise ultimately became one of the central pillars of that rebuilding process.

For Royce, watching his friend endure the transformation firsthand revealed an astonishing level of mental toughness beneath Eminem’s public image. The same obsessive intensity that once fueled destructive addiction had been redirected into something that could keep him alive.

Years later, Eminem’s recovery story remains one of the most remarkable reinventions in modern music — not because it was glamorous, but because of how physically brutal it truly was. Behind the awards, comeback albums, and sold-out performances stood a man literally running mile after mile in an attempt to escape the darkest chapter of his life.