By Salvador Rodriguez

Three weeks to go before Marcos Maidana (35-4, 31KOs) steps in the ring to rematch WBC/WBA welterweight champion Floyd Mayweather Jr. (46-0, 26KOs). The fight takes place on September 13th from the MGM Grand in Las vegas.

Maidana has been working with Mexican conditioning coach Raul Robles, who is know for his past work with Erik Morales, Jackie Nava and several others.

Robles is helping Maidana get faster and maintain his stamina. He sees Maidana improving vastly in both areas.

"Undoubtedly the power has improved. He throws quick punches and immediately counters back [to punches]. Today we did work on the mountain in Arroyo Verde. He did four laps at a rapid pace, closed with 12 repetitions of sprints. He is in great shape," Robles said.

"The workloads have declined, of course, in terms of strength but not in intensity. We've already left behind tools like weighted vests, dragging sleds. Now we are working on aspects of speed, agility and reaction."