Data collection for the outcome variables is conducted at the time of the subject recruitment (T1), and six (T2), nine (T3), and twelve (T4) months after the start of the intervention, except that physical activity levels of childhood cancer patients are collected at the time of the subject recruitment (T1), nine (T2), and twelve (T3) months after the start of the intervention. Before randomisation, participants are required to complete the hand grip strength test with the hand-held dynamometers (HHD) and fill in a set of questionnaires including CUHK-PARCY, the Chinese versions of PA-SE, FS-C or FS-A, CES-DC, and PedsQL cancer module. Semi-structured interviews will also be carried out.