I play 4+ hours of tennis per week wearing a mechanical watch, and I would agree it's probably tougher on watch than golf. In the past it has been the 1971 Speedy...
But for the last year or so it's been my Watchco SM300 that is my beater watch. It's for pretty much any outdoor activity, including concerts...
The article posted above is an odd one, but it seems only parts of it are posted so I'll withhold judgment. Let's just say the last thing I would be worried about when wearing an automatic watch playing golf or tennis would be the balance spring. The real danger to the watch comes from the inertia and shocks effect on the rotor. Stress to the axle or bearing are an issue, but even if everything stays intact the rotor can deflect and impact the movement.
Cheers, Al
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