When doing sit-ups, holding dumbbells with both hands behind the neck can increase the load of abdominal exercises; Lifting dumbbells to do lateral bending or turning exercises can exercise the internal and external oblique muscles of the abdomen; Keep your arms straight forward and lift dumbbells sideways to exercise your shoulder and chest muscles.
The method of dumbbell fat reduction is strength exercise (muscle exercise), which will increase the metabolic rate and thus reduce body fat.