Gym memberships aren’t cheap—and neither are personal trainers or nutritionists. So let technology coach you gratis. Terrific free, easy-to-use apps like MyFitnessPal and LoseIt will help keep track of your daily calorie intake as well as generate a customizable meal plan. Other zero-payment exercise apps, like Nike Training Club, offer full-body workouts that you can do almost anywhere. Over time you can accumulate points on the Nike app that unlock exclusive workouts from celeb personal trainers, like Nunez (gain access at 3,000 points), who is proud to share a unique routine that blends kung fu and salsa.