The phrase "isolation work" refers to exercises or activities that focus on targeting and working out specific muscles or body parts by themselves, rather than working out the whole body. Full definition
I spend some extra time at the end of my workout doing isolation work for 1 - 2 exercises. (shamelesspride.com)
Lots of bodybuilders do compound movements before doing isolation work, and this is one of the key reasons why their calves won't grow. (fitnessandpower.com)
Technology can also help address the downsides, including the possible sense of isolation those working at home may feel. (prismlegal.com)