Undertraining Vs Overtraining? I vote for the former, Less is more!

As a practical matter, almost all training should be undertraining because the only way to know your exact limits is to actually cross them, and then it's too late. If you over-train, you are basically opening pandora's box of injuries and CNS overload performing weights & cycling. When an athlete is overtrained, the extended recovery time negates any sort of increase in performance that the athlete may have had.