My favorite is to use an elliptical machine, warm up a little then crank it to maximum resistance and just go as hard as I can until I&#x27;m done. I can induce a &quot;runner&#x27;s high&quot; within a few minutes that feels amazing, and I prefer it to treadmill&#x2F;cycle for the whole-body workout (you can really utilize arms&#x2F;shoulders&#x2F;back&#x2F;core on the elliptical)<p>I&#x27;m usually done within 10 minutes, and if I&#x27;ve been out of practice I can certainly feel it the next day.