principle, yes. But you should of course avoid them wherever possible.
Or tighten the watchstrap as much as possible - this alone is a good way
of reducing the effects of impacts. It also helps to compensate for
fluctuations in temperature.
mechanical wristwatch is a precision instrument. Tolerances at the
manufacturing stage are in the hundredths and thousandths of
millimetres. Extreme, repeated shocks and impacts, of the kind that
might be encountered riding off-road on a motorcycle or mountain bike,
can have a negative influence on the rate of a watch movement.