Story wise, it is inspiring. To hear the story of drug addict sport icon who changed himself to be the best version of himself, his sheer resilience and courage through all the hardships is great.
But I believe he has to improve his writing a bit. Some points and phrases are repeated multiple times. Could have arranged the story better. But it doesn't mean the book isn't great. Just saying there are things to be improved.
Other than that, a good read. You can learn something for your life.