Posterior tibial tendonitis

Hi,

I'm reaching out for some advice regarding a temporary setback in my running routine. My doctor has advised me to take a 2-3 week break from running/high impact activity.

It's frustrating, especially with the rbc half coming up that I was training for. I'd really appreciate any suggestions or tips on how recover effectively and strengthen so I reduce the chances of flaring up this tendon again in the future.

I’d like to stay as close to current fitness levels as possible and be ready to bounce back (possibly still run the half if things are feeling better) once I'm cleared to run again. That said additionally if there are suggestions for cross training I’d love to hear it, one of the specifics I’ve been trying to figure out is trying to mimic a long run effort without running