First, according to the numbers on the dumbbell, the weight of the dumbbell is calculated as 2 * (2.5+2+1.25+0.5) =12.5 kg, but the overall weight of the dumbbell includes rods and screws, so the weight of a dumbbell is almost 15kg, so a pair is just like the 30kg mentioned by the store.
Extended data:
Although dumbbells are good, if you want to exercise with dumbbells, you should pay attention to the following points:
1, choose the right weight before practicing dumbbells, not the heavier the better, but the right one is the best.
2. If the purpose of practicing dumbbells is to gain muscle, then it is best to choose dumbbells with a load of 65%-85%, that is, if the load that can be lifted each time is 65,438+00 kg, then choose dumbbells with a weight of 6.5 kg-8.5 kg for exercise. During practice, each group should exercise 6-65,438+02 times, and the exercise speed should not be too fast, with an interval of 2-0 times.
3. If the purpose of practicing dumbbells is to reduce fat, then each group should practice 15-25 times or more, and the interval between each group should be controlled at 1-2 minutes. If you think this kind of exercise is boring, you can practice with your favorite music, or do dumbbell aerobics with music.
References:
Baidu encyclopedia-dumbbell