15-20 kg dumbbell is enough to train your body to 70kg. Fitness depends on training. Generally speaking, if you practice by eating, you should practice three or four times a week for 30 to 40 minutes each time. If you eat it, you should supplement about 20g of protein every day, that is, you should eat four eggs or100g of beef more than one year, which is almost enough. At least 130 kg can be obtained.