FIGURE 1-11 Body Cavities. (a) The dorsal body cavity is bounded by the bones of the skull and vertebral column. The muscular diaphragm divides the ventral body cavity into a superior thoracic (chest) cavity and an inferior abdominopelvic cavity.he Thoracic Cavity The walls of the thoracic cavity surround the lungs and heart; associated organs of the respiratory, cardiovascular, and lymphatic systems; the inferior portions of the esophagus; and the thymus.
Half marathon. A half marathon is a road running event of 21.0975 kilometres (13.1094 mi) â half the distance of a marathon. Participation in half marathons has grown steadily since 2003, partly due to the fact that it is a challenging distance, but does not require the same level of training that a marathon does.
When in doubt, slow down. To help guide you, a runner training for a half marathon should run their recovery runs about 1-2 minutes slower than their goal half marathon pace in order to maintain a true recovery pace. For a marathoner, recovery pace is about 60-90 seconds slower per mile than marathon goal pace.hat is an easy recovery run. A recovery run is a training day that is designed to facilitate recovery by delivering oxygen and nutrients to the muscles damaged during running. The main purpose of a recovery run is restoration, not building aerobic strength.