A dumbbell is a weight training equipment, which typically consists of a short bar with a weighted ball or disk at each end. They come in different sizes and weights, and can be used for various exercises that target different muscle groups in the body. Dumbbells are a popular choice for strength training because they are versatile, easy to use, and can be used almost anywhere.

Some examples of dumbbell exercises include bicep curls, shoulder presses, chest flies, and dumbbell lunges. Dumbbell exercises can be done individually or as part of a workout-routine">workout routine, and can be modified to suit different fitness levels.

Synonyms for dumbbell include hand weights, free weights, and weights. Antonyms for dumbbell would be bodyweight exercises and resistance bands, as they do not require external weights. Related terms include barbells (which are longer and have weights on both ends), kettlebells (which have a more rounded shape), and weight plates (which can be added to a barbell or other equipment).

Dumbbells should not be confused with fixed-weight machines, which are typically used in gyms and have a set weight that cannot be adjusted. While machines can be useful for targeting specific muscle groups, dumbbells allow for greater range of motion and a wider variety of exercises.