This depends on the type of treatment he received for the torn Achilles
tendon. Was a slight tear or complete rupture?
If it was a slight tear there was a chance he received non-surgical
treatment. If this is the case there is a higher likelihood of re-rupture
which will require extreme caution during personal training.
If he had surgery to repair the tendon it is less likely to re-tear. A
slightly more aggressive training approach may be taken.
The most important things about personal training is injury prevention.
Make sure he warms up thoroughly with a low impact exercise such as the
Have him write the alphabet with his toes multiple times a day to ensure
full range of motion and flexibility.
Start with low impact exercises such as walking and stepping up small
steps before progressing.
Perform calf strengthening exercises in a slow controlled manner at
Stretch the calf muscles thoroughly after general warm up and after
Always perform a general cardio cool down with light calf stretching
Encourage him to place ice on the Achilles tendon after training
If he has flat feet, encourage him to get professional orthotics or
store bought foot inserts at the very least.
Train the rest of his body as usual. Avoid any plyometric (jumping,
hopping) exercises for at least the first month of training.
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in front of the computer. Learn how you can develop rounded shoulders
posture and why this is bad for your health and can lead to injury.