This is a short video, in Spanish (no subtitles, sorry), where Pedro Diaz, Cotto's new trainer, talks about Miguel's stamina issues and how he has improved in this training camp. His methods seem quite scientific and when a reporter asked him about Cotto's stamina he said that Miguel's recuperating powers had increased from a paltry 17.5% in October to a 42% percent now. This is, apparently, measured by heart rate in between rounds. If you understand Spanish, it's a fun watch.