Just two months after sustaining a gruesome injury to his left leg, Anderson Silva is already back in the gym training for his planned comeback before the end of the year.

After photos of Silva doing gym work surfaced online several weeks ago, a video posted on Instagram was uploaded on Thursday showing how serious Silva is in his bid to return this year. Silva was shown hitting the mitts with his boxing coach.

UFC President Dana White personally witnessed Silva working out at the gym. The longtime UFC president was impressed with how fast the Brazilian mixed martial arts superstar is recovering just eight weeks after most experts predicted that SIlva's storied career was likely over.

"This is actually crazy," White said of Silva's recovery, the Daily Mail reported. "Look at all the bone growth that he has in eight weeks. He said sometimes you don't see that kind of bone growth in people over a couple of years. Pretty crazy."

White previously said that he was expecting Silva to return to the Octagon by the end of the year. But White also added that anything can happen between now and December, saying that fans should just wait and see if the 38-year-old Brazilian can overcome the hurdles on his road to recovery.

"We'll see what happens. Anything can happen. He can hurt it again in training or anything is possible. He could start training and not feel the same. We'll just see how it all plays out," White said.

Chris Weidman Wants Silva Back

Meanwhile, reigning UFC middleweight champion Chris Weidman, who defeated Silva in their last two fights—including the one that ended with Silva's broken leg—said that he would love to see his rival back.

"If he comes back healthy and his mind's in the right place, I'd love to see him come back," Weidman said in an interview with MMAjunkie.

However, Weidman, who previously said that he would be open to a third fight, quickly added that Silva should only consider fighting in the Octagon again if he is truly healthy and if he still has the confidence to make a kick using his left leg.

"But if he comes back and he's truly not healthy, if he's not kicking with that leg like he used to, if he's not mentally confident like he usually was - he had such a confidence about him - if he doesn't have that anymore, then I hope he doesn't come back," Weidman said.