Generally speaking, the heaviest kettle bell is 48kg, which can't meet the heavy load training. When it comes to bearing weight, barbell is the only king. After all, the load can be increased infinitely (theoretically). No matter bench press, hard pull, squat or snatch, only barbell can meet the demand of extreme strength growth. And some sports use barbells, which have more advantages. Hard pulling barbell is not only because it can increase the load, but also because the barbell is fixed and close to the body, which is more suitable for holding power with both hands than kettle bell. Squat barbell, fixed position can make bones play a better supporting role, so that the body can concentrate leg strength. The kettle bell and dumbbell can be used interchangeably to complete the bending and side lifting of biceps brachii. Traditional instrument training focuses on lower times and higher load, while kettle bell training focuses on faster movement speed, more times and longer time.