Exercising When You're Sick, Hungover, Injured, or Sore

Feeling ill and wondering if it means you'll have to forgo a day's sweat session? First, figure out your symptoms to see whether or not you should stay in bed. In general, a sickness that causes above the neck symptoms — like a headache, congestion, or a runny nose — means you can exercise. Any flu-like symptoms like aches or pains, chest congestion, nausea, or a fever, means you should stay away from your fitness gear until you feel better.
Best exercises: Yoga may help both migraines and headaches; check out this yoga sequence for relieving tension headaches. If you have a cold or are congested, exercise at half your regular intensity and gradually increase until you are at 80 percent (reduce intensity if you still aren't feeling well). Remember to take it easy while your energy levels are down; working up a sweat will not make your sickness go away faster.