A few years back, we had Twila from Pure Fitness show us some really good strength exercises to make our bodies very resilient.
It's best to add these exercises into your regime gradually -- they don't seem like much when you first do them, but then the next day, you realize they strengthen all of your muscles that are very weak!!
Do a few light reps of these your first time and see how your body feels the next day before building up to more reps.
After 4 or 5 weeks (of doing these twice a week), you could build up to 6 to 10 reps of each exercise.
Again, be really gradual as you add these in.
I have been doing these exercise once or twice every week for 9 years and it's really allowed me to be quite injury-free over that time. But I always do a good warm-up and never push myself very hard with them -- just a modest workout that helps balance my body with everything else I do.