What a static prompt can do
It can propose a structure from stated days, goals, equipment and preferences. The output still needs checking for exercise fit, total work, progression and safety context.
What connection adds
A permitted tool can fetch saved workouts, recent performance and the actual weekly schedule. It can also make a validated change when write permission exists instead of returning instructions the athlete must copy manually.
Keep approval visible
Connection should not turn an AI answer into invisible authority. The athlete should know which client is connected, what it can read or write and how to revoke it.