Tendons

[twtd]

I've recently started lifting with a couple of friends, and while I'm really enjoying it and my muscles aren't too terribly sore now that they've gotten used to doing things again, my tendons are not as happy. I've had problems with tendonitis and tendonosis in the past, and I'm wondering if there are any good exercises to increase tendon strength/resiliency, mainly in my knees and elbows. I've found some achilles tendon exercises but that's probably the one tendon I know how to train/stretch/strengthen. I'm at a loss for the others. I know that my tendons are going to give out long before my muscles do and I'd like to prevent that from happening. I'd love any suggestions.