60 Chinese men aged between 21 and 60 years old with overweight/obesity (25 kg/m2 <BMI < 32.5 kg/m2) and prediabetes will be recruited.The participants will be divided into three age-matched groups (n=20 in each group),including high intensity exercise, moderate intensity exercise, and non-exercise groups. The suitability of each participant for physical exercise will be assessed by an in-house exercise specialist, based on parameters of blood pressure, strength, cardiovascular fitness, balance, flexibility. The exercise program will consist of three sessions per week over the course of 12 weeks, under the supervision of our in-house exercise specialists and physiologists. Each session will comprise of warm-up, resistance and aerobic training components and a cool-down. The high intensity training (aerobic combined with strength training) will consist of six exercises of three sets each, with each exercise set at an intensity of 6 to 10 repetition maximum. Intensity, volume and exercise selection will be varied both within the week and over the 12 week program in a periodised system designed to maximize muscle hypertrophy and strength gain. Exercise intensity will be at 60 to 80% of estimated heart rate maximum. Moderate intensity training (Aerobic training) will be conducted on a variety of ergometers including treadmill, cycle, rowing and cross training machines. The non-exercise group (delayed group) will be used as placebo control, and will participate in the training group at the later stage.