Sergio Martinez says he's in 'constant pain' due to long hours training

Fighting with injuries (knee, elbow, wrist), how hard is it to prepare when your body hurts for any fight?

"It is not easy to prepare for a fight when you have some of the ailments that I have when preparing for a World Championship fight. I struggle with joint pains, knee pain, and shoulder pain. Without my physical therapist, Dr. Raquel Bordons, I would not be able to train today, and probably would've had to retire due to my injuries.

"Because I train 6 days a week for an average of 8 hours a day, I am always in constant pain. There are some days when I am so sore that I cannot even walk but I push myself because I know that I have to push myself to be the best fighter in the world. I know that I have to put in more hours than your average fighter because I didn't grow up a boxer. I started very late in this sport, so that is why I have to train so many hours and put in a lot of work in order to perform at the level that is expected of me and for me to come out victorious."

"2 Days: Sergio Martinez" premieres Saturday, May 24 at 11:00 p.m. ET/PT on HBO.

HBO's Emmy-Award-winning series "24/7 Cotto/Martinez" premieres Saturday, May 31 at 11:15 p.m. ET/PT on HBO.

Cotto vs. Martinez happens Saturday, June 7 live on pay-per-view beginning at 9:00 p.m. ET/6:00 p.m. PT.