Resistance bands are essential in strength training because they provide variable resistance throughout exercises. This helps to engage muscle fibers effectively, promoting strength and toning. Bands are versatile, allowing users to perform a wide range of exercises targeting different muscle groups. Additionally, they are portable, making them convenient for workouts at home or while traveling. Their adaptability to various fitness levels also enables progressive overload, which is key for muscle development. Consequently, incorporating resistance bands can enhance any training program.