Had various rib problems ,and one thing is for sure once you have cracked them once they are weaker.
  Look at seat size , wear your protector snug but not tight .
  And if you have a cracked rib your looking at 3 to 4 months to heal properly .
  Rib protector or not if you drive with it cracked it will be agony ,and it will make it worse.
  if its a muscular injury then 4 to 6 weeks .
 
  Do plenty of work on your Lats in the gym ,and also ab work and core strength .
  Fitness wise you should be looking at doing a reasonable amount of cardio work , and make sure any weights work you do is lower weights higher reps ,as to not build to much muscle mass but works the muscles for endurance .
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