Exercise Challenges If you’re looking for some exercise challenges, here they are! More will be added as we find them. #1: Focus on your arms, abs, and backside with these three exercises for 30 days: push-ups, squats, and leg lifts. #2: Cater to your thighs, arms, and stomach with these three exercises for 30 days: burpees, lunges, and plank-pushups. #3: Try the flat belly challenge for as long as you want with these 10 exercises a day! #4: Build your cardiovascular endurance, muscular endurance, muscular strength, and flexibility by doing exercises for these categories every week.