Senior athlete with exercise-induced tachyarrhythmia

Male patient 65 yo. He carrier mitral valve prolapse (MVP) of anterior leaflet with mild mitral regurgitation. Sportsman o high-performance of mountain-bike mode. Asymptomatic and no history of sudden death in the family. During the test remained asymptomatic.

Questions

What is arrhythmia diagnosis ?

What is the proper conduct?