body’s insulin levels rise. Because the glucose cannot get into the muscle cells, the receptors on the surface of those cells become insensitive to insulin. The body then produces even more insulin and now has large

similar improvements in lower-body strength, with an increase in knee flexion and knee extension strength of

Furthermore, the production of stress hormones resulting from such overtraining also stimulates fat storage. Anyone who has attempted such a program of weight loss can confirm that you will end up feeling washed out, moody, and—worst of all—fatter. The truth is this: you cannot use physical activity to negate excess caloric intake.

to understand that your aerobic system performs at its highest level when recovering from lactic acidosis. After your high-intensity workout, when your metabolism is attempting to reduce the level of

program. If you are keeping track of your time under load, you may also find it helpful to keep a record of the

The main difference for most people is that they have less muscle in adulthood than they had in their late teens and early twenties.

METABOLISM Muscle is metabolically active tissue. Any loss of muscle with age leads to a lower energy requirement

health and fitness of our clients.

It’s even possible to perform a type of activity that is of insufficient intensity to bring about the desired metabolic adaptations yet is of sufficient volume to bring about large amounts of tissue destruction. This type of activity is called steady-state, or conventional, “aerobic” exercise. It cannot produce much in the way of metabolic