I had painful post-tib tendonitis when I first restarted running after a 20+ year break. I was going too fast and too far in rubbish shoes. After 8 weeks off, I then bought decent shoes, found C25k and stuck to a nice slow pace throughout. Over 5 years and 3500 miles (5500km) later - no re-occurance of post-tib tendonitis at all.
Bottom line - check your pace and make sure it's super slow and also wear decent running shoes that are comfortable.
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