It's the way the heat sinks into your bones on the fourth day.
Warmth wriggling past your salt-encrusted pores, down through the dermises into muscle, tendon.
They pull against your bones, making movement like they always have but this time slower less taut this time you, not fighting your own body
More saunter. More glide. feet press softly into the sand (there is sand everywhere) toes curl. release.