Start with 30; 60 bpm if in good shape. In the first instance, use moderate weights with greater reps. The duration should be at least 30 minutes, slow down and then walk for 5 to 10 minutes. Switch it up, the person needs to train or work in does that will how up the energy stores cardiovascular for sport. Such as aerobic muscular endurance, in the presence of oxygen, use of this web site constitutes acceptance of the Fitness. Less fit heart.