The spurge family contains a large variety of phytotoxins, often with a milky sap or latex. 5,735 Found mostly in the tropics, distinctive leaves typically with strong longitudinal veins and tertiary veins at right angles to the midrib.
Most marathon training plans range from 12 to 20 weeks. Beginning marathoners should aim to build their weekly mileage up to 50 miles over the four months leading up to race day. Three-to-five runs per week is sufficient. The vast majority of these runs should be done at a relaxed pace.
Athletes kept training more and more until overtraining was the norm. It takes about three weeks for the body to recover from overtraining. Thus, the marathon runners of the 1970s had to taper for three weeks before racing just to recover from their excessive training.