4. Stay loosey-goosey.

One tip that has really worked for me comes from the “Chi Running” school of thought. The idea is to keep your legs and upper body taut, but loose, while focusing on moving from a strength in your core. It sounds simple enough, but try paying attention to your muscles when you run. If you really tune in, you’ll probably find that you’re tightening up your legs, back, and arms. Yes, you’re using muscles in those areas that are contracting to help you move, but you don’t need to stiffen them or hold tension there. It will help you reduce post-run tightness if you focus on staying loose in your limbs.