Sluggishness, reduced energy, and soreness can be attributed to inactivity and slow lymphatic fluid movement.

“You will notice that if you don't get enough steps per day, your system, your body, will feel kind of sluggish. If you're sitting a lot because of travel, you should really strive to get as much movement in the airport as you can. Maybe, ideally, you take the stairs, you don't get on the conveyors, if you can manage to do that. Getting a lot of steps will help your body feel less sore, less sluggish, and not all, but a fair amount of the sluggishness that we feel when we don't move around a lot, when inactivity leads us to feel less energy, is the slow movement and the buildup of that lymphatic fluid.”