Monday: Warm-up: 10-minute jog Speed workout: 30 seconds of high knees, 30 seconds of butt kicks, 30 seconds of skipping, 30 seconds of jumping jacks, 30 seconds of mountain climbers. Repeat the circuit 3 times. Upper abs: 3 sets of 15-20 crunches Chest: 3 sets of 15-20 push-ups Biceps: 3 sets of 15-20 diamond push-ups Lower abs: 3 sets of 15-20 leg raises Tuesday: Warm-up: 10-minute jog Speed workout: 30 seconds of sprints, 30 seconds of rest. Repeat 10 times. Upper abs: 3 sets of 15-20 bicycle crunches Chest: 3 sets of 15-20 incline push-ups (using stairs or a raised surface) Biceps: 3 sets of 15-20 chair dips Lower abs: 3 sets of 15-20 hanging leg raises Wednesday: Warm-up: 10-minute jog Speed workout: 30 seconds of jumping lunges, 30 seconds of rest. Repeat 10 times. Upper abs: 3 sets of 15-20 Russian twists Chest: 3 sets of 15-20 wide push-ups Biceps: 3 sets of 15-20 close-grip push-ups Lower abs: 3 sets of 15-20 reverse crunches Thursday: Warm-up: 10-minute jog Speed workout: 30 seconds of burpees, 30 seconds of rest. Repeat 10 times. Upper abs: 3 sets of 15-20 seated leg tucks Chest: 3 sets of 15-20 decline push-ups (using stairs or a raised surface) Biceps: 3 sets of 15-20 pull-ups (using a tree branch or monkey bars if available) Lower abs: 3 sets of 15-20 scissor kicks Friday: Warm-up: 10-minute jog Speed workout: 30 seconds of jumping jacks, 30 seconds of high knees, 30 seconds of butt kicks, 30 seconds of skipping, 30 seconds of mountain climbers. Repeat the circuit 3 times. Upper abs: 3 sets of 15-20 Russian twists Chest: 3 sets of 15-20 diamond push-ups Biceps: 3 sets of 15-20 chair dips Lower abs: 3 sets of 15-20 leg raises