To warm up before a run, david begins by completing quad and hurdler's stretches. which of these accurately evaluates his choice of warm-up activities? a ) these activities are appropriate because they prepare muscles for intense movement. b)these activities are not appropriate because the muscles stretched are not warm yet. ] c) these activities are appropriate because they make the leg muscles more flexible. d)these activities are not appropriate because they stretch muscles not used in the exercise.

the warm up exercises done by david before the run will prepare his muscles for the intense movements required for the run. the muscles will be able to endure the stress of the run after the appropriate warm up. the quad and hurdler's stretches efficiently stretches the muscles of the legs making them less susceptible to any injury.

hence, the correct answer is 'option a - these activities are appropriate as they prepare muscles for intense movements'.

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

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