Experienced bodybuilders often use the four day split, because in this way they can train fewer muscle groups per workout, giving each of them sufficient attention and allowing training with higher volumes. (fitnessandpower.com)
One by one, try this with a few muscle groups — your feet, legs, stomach, for instance. (health.com)
You can target a few muscle groups daily, get a solid workout in a short amount of time. (davedreas.com)