Having a cochlear implant doesn´t stop you from taking part in the activities that you enjoy. You can swim with the audio processor on, if you use the appropriate accesories that will protect the device from water.
MED-EL´s WaterWear Waterproof Cover: https://www.medel.com/hearing-solutions/accessories/waterwear
Tipps for swimming with WaterWear: https://blog.medel.com/go-swimming-with-the-med-el-waterwear/