"Rigorous training" refers to a type of intense and thorough practice or instruction that requires a lot of effort, discipline, and perseverance in order to achieve a desired level of skill or expertise. Full definition
Potential service dogs go through rigorous training programs before they can team up with a handler. (thesprucepets.com)
He went through rigorous training in both dental work assistance and office management procedures and is now ready to work in the real dental world. (coverlettersandresume.com)
They commit themselves to months and months of rigorous training in order to complete an incredibly physically demanding challenge. (inc.com)