The concrete operational stage is the third stage of Piaget's theory of cognitive development. This stage, which follows the preoperational stage, occurs between the ages of 7 and 11 (preadolescence) years, and is characterized by the appropriate use of logic.
Bicycle riding can relieve the pain and inflammation of osteoarthritis. Osteoarthritis is a degenerative form of arthritis that results from wear and tear to the knee joint and knee cartilage over time. Your knees, hips, shoulders and hands are most susceptible to osteoarthritis damage. If you experience osteoarthritis, you can engage in low-impact exercises like bicycle riding. There are many types of bicycle riding, however, and some may be better than others for arthritis treatment.
Powering Through the Legs and Glutes. The quadriceps, hamstrings, calf and gluteus muscles perform the bulk of the biker's work. That's a good thing, because these large muscle groups burn more calories than small muscle groups, such as the biceps, do. Before riding, check your seat height. When seated, your leg should remain slightly bent when your foot is at the bottom of the pedal's motion.