Key Tips:
Avoid injury all together.
Once you start feeling something might not be right, if you have a "niggle":  STOP.  Stretch.  Foam Roll.  Then try again.
If the niggle is still there, stop and give yourself a couple of days to recover.
Placement of your sessions is everything.  Do your swims as a 2nd workout.
Communicate with your coach.  

Tight Calves?
Don't run hills
Don't run fast
Don't do big gear work.

Planter faciatis management
- Rub soothing ointment
- Roll on a tennis ball
- Epsom Salts
- Eat properly
- Use ice tight clay
- Theragun or shockwave therapy