Answer first
You can swim, sweat and play sport with a well-attached hair system. Choose a stronger attachment if you are very active, rinse off chlorine or sea water soon after, and dry the base fully so sweat doesn't loosen the hold.
Gym and running
Sweat is the main enemy of adhesive. A headband and a quick cool dry after training help.
Pools and the sea
Wet the hair with clean water before swimming, wear a cap if you can, and rinse and condition after.
Contact sports
Tell your consultant; a different base or attachment may suit you better.
Questions
Will it fall off in the water?
Not when attached properly for your activity; we adjust the method to your routine.
Is chlorine a problem?
It dries the hair, so rinse and condition soon after.