Working out and getting the heart rate up is critical to be a well rounded person, but you can integrate fine motor skills with your workouts. Integration is good time management where we can train certain fundamentals of trigger control, strong hand only manipulation, draws, reloads, shifting sight awareness from close to far targets, etc. Further, working fine motor skills while the heart rate is elevated trains our bodies to perform under physical stress.
Training can be a simple as setting a count down timer on intervals and every 2 min grab the gun and tag 3 sets of targets. The targets can be a simple as the clock, light switches...fill in the blank.