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Roxy is exercising with the jump rope although she is standing next to Hector she is having difficulty speaking to him due to her exertion therefore it is likely that Roxy is exercising at
She is exercising at a rate that is near her lactic threshold. She is undertaking an anaerobic exercise that is designed to increase her level of fitness and increase her performance level. Difficulty speaking is an indicator that she is performing at a level near her heart-rate maximum.
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