While walking or using the stair-climber or another cardio machine, you might focus on your breathing or heart rate to gauge how hard you’re working. That’s a perfectly good approach—but it won’t tell ...
NEW DELHI, INDIA JULY 17: A health worker in PPE coveralls collects swab sample from a man for Covid-19 rapid antigen testing at a government dispensary, in Mehrauli, on July 17, 2020 in New Delhi, ...
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