this depends on how long you has been feeling this way, if just a couple of days it could be a cold coming on or a minor bug, take some aspirin or Tylenol but if this is longer than a week, a doctor should diagnose this problem with some blood-work and a good checkup.
Rest.
there is force that makes your muscles tired
All exercises eventually make muscles tired.
You can sooth tired muscles by getting a massage, or massaging the effected muscles yourself. You can also use a warm compress or icy hot which can help soothe your tired muscles.
Even the strongest muscles can get tired if they are overworked. When muscles get tired, they may become cramped or experience pain. It is best to refrain from exertion when the muscles start hurting.
The lips may shake when they are tired because the facial muscles may be tense. Tense or tired muscles may shake or tremor.
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A cold compress is good for swollen tissues. For tired muscles the best thing is heat or massage.
Use your legs.
YOUR BRAIN REACTION,YOUR muscles, tired or no tired,even weather.
lactic acid accumulation
Because the heat makes your muscles relax and therefore makes you tired.