overtrain
verb
over·train ˌō-vər-ˈtrān 
overtrained; overtraining; overtrains
transitive + intransitive
: to train (a person or animal) to excess or beyond advantage : to harm (a person or animal) by too much training
an athlete who overtrains
Don't overtrain your dog. Lots of small lessons are better than one big one.
Larrie Todd
Larrie Todd
Word History
First Known Use
1872, in the meaning defined above