7. Boring workouts
No matter how good the fitness plan, sticking with the exact same routine day after day is hard—and discouraging. In his first book, 5-Factor Fitness, Hollywood trainer Harley Pastnernak recommends a different workout for every day of the week, each focusing on a different body part. Whether you vary the number of reps you do or make a switch from cardio to resistance training, it’s important to vary your routine enough so you don’t get bored. “At least one thing should be different daily,” Pasternak suggests.