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    Fitness professionals have changed their tune on this over the years. The current Physical Activity Guidelines for Americans says that  everything  counts toward those weekly activity targets (as long as the intensity is high enough). You can take a 5-minute walk up the block, climb the stairs in your home a few times, or stand up from your desk and do a set of squats.  “More recent data shows that there are health benefits to accumulating activity. Those short ‘exercise snacks’ add up,” says Sallis. Jumping into a busy and intense exercise routine can set you up for mental and physical burnout — and it puts you at risk of injury, too.  Sallis recommends beginning where you are comfortable (in terms of distance if you are walking or jogging, or in terms of weights if you are strength training) and slowly increasing the duration and intensity over a period of weeks or months. Getting on an exercise program (look at apps or small gro...

A frequently cited peer-reviewed research paper from 1985 defined the difference between the terms “physical activity” (bodily movement resulting in energy expenditure), “exercise” (planned and structured physical activity), and “physical fitness.” The paper defined physical fitness as a set of attributes that people have or achieve that determines their ability to carry out daily tasks with vigor and alertness, without undue fatigue. Cardiorespiratory endurance,  muscular endurance, muscular strength, body composition, and flexibility are components that can be used to measure fitness, also according to that paper.  In the real world, fitness translates to function, says Dr. Smith-Ryan. For example, can you carry your groceries or walk up the stairs without getting winded? Can you run around the backyard with your kids? Can you climb the stairs. There are a few main components of fitness, all of which are important for building a well-rounded exercise routine....