Why your water target should change with the weather
Eight glasses a day is a slogan, not a plan. The amount of water you need is not fixed. It moves with the heat, the humidity and how hard you are working, and a single static target misses all of it.
Sweat is the variable
On a cool, still day at a desk, your losses are modest. On a hot, humid day, or during hard training, you can lose well over a litre of sweat in an hour. A goal that does not account for that is either too high on easy days or far too low on hard ones.
Humidity makes it worse in a way people underestimate. When the air is already saturated, sweat evaporates poorly, so you keep sweating to try to cool down, and the losses climb even though you may not feel drenched.
Reading your own signals
You do not need lab equipment to gauge this. Thirst, urine colour and how you feel late in a session are decent guides. Pale and frequent is well hydrated, dark and infrequent means you are behind.
A useful trick for training is to weigh yourself before and after a hard session. Most of the short term change is water, and roughly each kilogram lost is about a litre to replace over the hours that follow.
A target that adapts
The better approach is a hydration goal that flexes with conditions and activity, rather than one number you chase every day. Hot forecast plus a long session should raise the bar automatically.
Equil reads the weather and your training load and shifts your hydration target to match, so the goal reflects what you are actually losing today, not an average that fits no single day well.
Stop tracking by hand
Equil reads your food, glucose, sleep and training, then adjusts your plan in real time. Not another logger, a coach.
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