Drink a cup of lemon water.
Hot or cold, I think lemon water to be the quickest fix in the business. Lemon water first thing in the morning is always a great idea, but it also works to combat midday exhaustion. When I start to feel tired in the afternoon, I squeeze half a lemon into my mug and usually fill with ice-cold water. It will give you a good energy boost, great skin, and reduce inflammation.
Do a 10-minute mini workout.
Yes, you can totally keep this sweat free! Try a quick routine from Mary Helen Bowers' Ballet Beautiful or if you have a few extra minutes, try this one from ModelFit. If you've only got five minutes, do three sets of 20 Russian twists, 20 sit-ups, and 10 double leg lifts. I promise, you'll feel so much better afterwards.
Alternate shower temperatures.
Hot/Cold hydrotherapy is a guaranteed way to wake up, reduce stress, and relieve pain. Get into your shower, starting at a comfortable temperature. Then, increase the temperature until it is nearly too hot to handle. Let the hot water cover you, then immediately turn it down to the coldest setting. Next, return to hot and repeat this a few times. Bonus points if you dry brush your skin beforehand.
Practice several rounds of Nadi Shodhana breathing.
This is also known as alternate nostril breathing and is a really easy way to calm your nerves and reduce stress. The technique is as simple as breathing in through one nostril (with the other held closed), then breathing out the opposite and repeat.
Draw a bath with essential oils and Epsom salts.
For a classic fix, fill your tub with warm water and add a few drops of an essential oil and a few scoops of Epsom salt. If you're having trouble sleeping, try valerian. If you have a cold, eucalyptus or spruce and pine. For sore muscles, a great solution is juniper or arnica.