This is the sharpest reversal in the seasonal calendar, and it catches people every year.
Everything spring asked for — pungent, dry, light, stimulating, vigorous — now becomes its opposite. Summer asks for sweet, cool, liquid and unctuous, and for noticeably less effort. The person who carries April's ginger-and-exercise regimen into June is doing precise, deliberate harm.
The reason is the classical model of the sun's course. From January to July the sun is in adana kala — the taking-away time. It is described as drawing moisture and strength out of the earth and out of people, and Grishma is its endpoint: the season the texts identify as having the least bodily strength of the entire year. Digestion is at its weakest. Capacity is at its lowest.
Which is exactly counter to how summer feels culturally — long days, holidays, energy. Ayurveda's reading is that summer's brightness is external and the body's reserves are the opposite.
So across this fortnight: pungency comes down first and furthest. Exercise reduces to a fraction of April's and moves to the cool ends of the day. Sweet, cooling, liquid food comes up. Cold water, coconut water, sweet fruit, rice, milk, ghee. The dry brushing stops; light oil returns.
And Vata quietly begins to accumulate in the dryness — which is the thing this season is really banking for the rains.