In Ayurveda summer is associated with Pitta and its qualities of heat and the element of fire. Although we need fire to digest, transform and metabolise, too much fire can literally cause burned-outs, anger, stress, heat rash and heart burn. When the external fire, the sun, is excessively hot we can try to create balance by reducing other sources of heat and embracing cooling practices.
But before you stop any good work and reach for the biscuits I'm not advocating sitting about and eating badly! Better to adopt a few healthy habits that you can bring about to nurture and restore yourself at this time of year, and save the more full-on cleansing till spring when you're more energetically able to cope with it.
Do NOT go on a meditation retreat if you've never meditated before. It will hurt your brain. It will hurt your brain so hard you'll think it's trying to give birth to acorns out of your ears and, whilst you could probably make quite a bit of money as a circus act doing that, IT WILL NOT MAKE YOU HAPPY.