Here's the achilles tendon rehab program that Mike Forgraves
prescribed for anyone experiencing achilles problems. It's also a
good strengthening program for preventing such problems.

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This stretching program is highly effective in breaking down scar
tissue in the achilles tendon, allowing the tendon to heal cleanly
while improving flexibility.
The program takes four weeks to complete.

Weeks 1 & 2
Stand with the balls of both feet on the edge of a step.
At a slow, steady pace, gently drop the heels as far a possible, the
raise the heels as high as possible. To determine pace, lowere for
the count of Thousand-One, Thousand-two, Thousand-three and lift for
the same.
Do three sets of 20 repetitions. Take about 3-4 minute recovery between
sets.

Week Three
Repeat the exercises from the first two weeks, but lift and lower as
fast as possible, making sure you continue moving through your full
range of motion. Perform three sets of 20 repetitions

Week Four
Using one foot only, lift and lower 10 times using the slower speed.
Then do another 10 reps at the faster speed.
Perform three sets of 20 repetitions.