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.
To find the right machine for you, be sure to try before you buy. Exercise bikes vary in size and shape, so when you're shopping for one, adjust it for your size in the store. Look for a comfortable seat and pedals that fit your feet. We found a few ergonomic and comfort quibbles with some bikes. On one bike we tested, the seat can adjust for users up to 6 feet 2 inches, but we found that anyone over about 5 feet 8 inches hit their knees on the handlebars.