Below is a great 3 minute video on the Cook and Purdham Tendon Continuun
As you can see, Redmond are quite dynamic. Appropriate loading, activity management, lifestyle modification, and physical therapy can help.
But the easiest way to avoid getting a tendinopathy is being aware of how you're loading your body. Be mindful of the progressions. Treat your body like a friend. Wade into the water, don't just jump in.