3. Committing to the same fitness routine every day
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.