CANELO ALVAREZ knows all too well about packing on the pounds in a bid for boxing glory.
The Mexican superstar won his first piece of gold in the 154lb light-middleweight division but he has gone as high as 175lb at light-heavy.
Canelo has since settled down as the 168lb undisputed super-middleweight king – a weight he has never lost at.
But on Saturday night the roles will be reversed when Jermell Charlo jumps TWO divisions from light-middle to challenge Alvarez.
The American will go up 14lb – which is ONE STONE – but even Canelo believes Charlo has the size and skills to make the leap of faith.