I am training myself to be a healthier and muscular man. I go to training gym nearby. The gym is Gold's Gym (Gorudo Jimu, in Japanese) located neaby area. It has good equipments and interior is fancy. Its trainers are well-educated and kind. I recently realized that I should do work-outs not only at gym but also at home. I do not know how. I never had any work-out machine at home though I had a treadmill. Then I asked a former Gold's Gym trainer who is now working as a freelance to come over to my place and give me instruction. I bought a dumbbell (10kg) for that. His...