Question

if a person is working on a treadmill in a gym will it effect his rate of breathing how

Answer 1

yes, his breathing rate will increase. Because during this period he physically works hard and so his body requires high energy. To fulfill this requirement the body has to make energy at faster rate due to this it requires more oxygen. To fulfill this requirement of oxygen, his breathing rate increases.
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Answer 2

Yes, the breathing rate will be affected and it will become fast in order to meet the energy demand through respired oxygen