A total of 220 men with a diagnosis of prostate cancer, scheduled to receive radiation will be recruited. The study is a parallel 3-group design with groups stratified for intended duration of ADT ( greater or less than 12 weeks) and random assignment to aerobic, resistance or Wait List control groups. The dependent variable of interest will fatigue measured at 24 weeks by the 13 item FACT-Fatigue. Dependent variables of secondary interest will be toxicity of radiation, body composition, muscular fitness, cardio-respiratory fitness, metabolic fitness, and prostate specific QOL. All exercise sessions will be performed 3 times per week at the Ottawa Hospital regional Cancer Center