Adjustable water dumbbells provide combined hydration management and resistance training. Fill capacity ranges from 500 ml (1 lb) to 2500 ml (5 lbs) to match workouts and user strength. Benefits at a glance: suitable for strength and hydration needs, and adjustable resistance for progressive training. Use scenarios Poolside workouts and water rehabilitation: water resistance supports strength work while enabling quick hydration between sets. Rehabilitation and low impact training: light to moderate resistance suitable for recovery and gradual progression. Outdoor group training and travel: five color options to suit style, with performance in outdoor settings and portability. Durability and environment: available in five colors; designed to maintain structural integrity in environments from 0 to 40 degrees Celsius. Why choose: a versatile tool that combines resistance training and hydration management in one compact package, suitable for fitness enthusiasts, patients, and outdoor athletes.