Individuals should consider varying their exercise routines for two fundamental reasons: to prevent boredom associated with doing the same things workout after workout and to consistently progress and not remain stagnant. Research has shown that adding variety to an exercise program can improve adherence.
Keep in mind that doing the exact same workout, day after day is not necessarily a bad thing. Some people enjoy a predictable, consistent routine. They don't mind the possibility of experiencing a training plateau and are content to maintain their health and fitness levels with a comfortable exercise habit. However, many individuals need to push themselves to new levels and try different activities to stay enthusiastic and excited about their workouts. By varying their exercise routines, individuals can not only stay physically challenged but mentally stimulated as well.