Singer Peter Andre is embarking on a cycling challenge to help raise money for hospitals in Zanzibar.

The Mysterious Girl hitmaker is teaming up with his brothers for a gruelling week-long bicycle trek next June (13) in aid of the Health Improvement Project Zanzibar, which aims to improve the island's hospitals.

The Australian star has asked his followers to pledge donations to the cause, which is close to his heart after meeting locals in an orphanage and hospital in Zanzibar earlier this year (12).

In posts on his Twitter page, he writes, "My brothers and I are going to help in the hospitals of Zanzibar. We need to raise as much as poss (possible) for our bike ride. Please help. Even one pound each will make a huge difference. One pound each would completely change the whole health care system in Zanzibar."