<i>These guys probably aren&#x27;t really working all that hard. If you have time to read emails and surf the web then you should exercise harder.</i><p>True if you’re doing cardio exercise. If you’re doing some kind of weight program for strength &#x2F; muscle building then you get best results in terms of results achieved &#x2F; time expended (according to r&#x2F;bodyweightfitness &amp; r&#x2F;fitness FAQs) by resting for 5 minutes or so in between each set of an exercise so that your muscles can replenish their stored energy reserves. You can use some of that time to do a different exercise, but you probably still have some downtime left: The r&#x2F;bodyweightfitness program leaves 90s inbetween each set of paired exercises. That’s time to read a few emails, surf the web etc.