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.
A properly fitting bike is important for avoiding cycling-related knee injuries. Riding a bike is a low-impact exercise, but knee pain for cycling enthusiasts is common. The health concern that readers of Bicycling most frequently write to the magazine about is knees. This could lead you to think that cycling is bad for your knees, but that's not necessarily true. You just have to have the right equipment and engage in the exercise correctly for cycling to be good for your knees.