In the same vein (but healthier!) as diet plans that mix up your caloric goals, here’s a 7-day plan that gets harder as it goes along. Start on Day One, follow the plan for a week, then repeat. Yes, it’ll seem ridiculously easy going from Day Seven back to Day One, but this will keep your body challenged and will give you a bit of a break every time you restart. Feel free to make this an eight-day plan and add in a rest day on Day Eight.