PiYo is an 8 week exercise program that is a blend of Pilates and Yoga. Developed by American fitness guru Chalene Johnson as part of Beachbody, PiYo is a low-impact workout that strengthens and sculpts the body, and enhances flexibility. The Pilates part strengthens and tones the body, while the Yoga part promotes mindfulness and relaxation. As such, PiYo provides a total mind-body workout.
You should stop doing PiYo after eight weeks.
PiYo is an eight week program. It isn't specified if you should stop or continue after the eight week period. It may have been difficult because the answer is unspecified.