Athletics of To-Day 1929

Athletics of To-day the left foot, and from the left foot take off for the jump. Experimentation, however, may prove that it is best for you, personally, to start the hop from the left foot. This you must determine for yourself. The diagram given in Fig. 2I shows angles of take-off, parabola of flight, and range. In the hop, AB, the take-off angle formed between the lines AE and AB is one of 40 degrees (see also No. I, Plate 30). The highest point in the parabola AHB is found to be 4ft. 2 ins., and the range of the hop AB is I 8 ft. In the step, BC, the take-off angle formed between the lines BF and BC is 25 degrees. The highest point in the parabola BHC is at I ft. 9 ins., and the range BC is I2 ft. In the jump, CD, the take-off angle formed between the lines CG and CD is the true long jump angle of 45 degrees, the FIG. 21. highest point in the parabola CHD is approximately 5 ft. and the range CD is 2I ft. The diagrams and calculations, which are only approximately correct, are based upon my observation of A. W. Winter's world's record hop, step, and jump made at Paris in I924. The diagram is important as it shows the way the triple effort is broken up into its three component parts and shows also the conservation of energy in the hop and step actions. The whole hop, step, and jump will now be summarised for the benefit of the novice. The run-up is measured, regularised, and made at top-speed, as described for the long jump. The take-off is also as des– cribed, except that the jumper does not put quite all his force into the hop, and his take-off angle is 40 degrees instead of 45 degrees. The take-off leg is allowed to hang until the highest