The Numbers Don't Lie
A landmark study from the University of Connecticut found that just 2% dehydration (losing 2% of body weight through water loss) causes:
- 10-20% decrease in strength performance
- Impaired cognitive function (slower reaction times, worse coordination)
- Increased perceived effort (the same weight feels heavier)
- Reduced endurance (fatigue sets in 15-20% earlier)
- Impaired recovery (protein synthesis drops)
At 170 lbs, 2% dehydration is just 3.4 lbs of water — you can lose that in a single hard workout without replacing fluids.
How Much Water Do You Actually Need?
The "8 glasses a day" rule is outdated and not based on science. Here's the evidence-based formula:
Baseline: 35ml per kg of bodyweight per day
- At 77kg (170 lbs): 2,700ml = 2.7L per day
Training days: Add 500-1000ml per hour of exercise
- 1-hour gym session: 3.2-3.7L total
Hot weather / outdoor training: Add another 500ml
For most active adults in the GTA: 3L per day is a solid target. Adjust up on heavy training days.
Signs you're dehydrated: Dark yellow urine, headaches, fatigue, muscle cramps, dry mouth. If you're thirsty, you're already 1-2% dehydrated.
The FIXIT Water Tracking Method
We built water tracking into FIXIT because most people have no idea how much they actually drink.
How it works:
1. Open Health → Today tab
2. Tap +250ml or +500ml every time you drink
3. The progress ring fills up toward your 3L target
4. At 90%, it turns green — you're hydrated
Pro tip: Set 3 anchor points:
- Morning coffee → log 500ml water after
- Lunch → log 500ml
- Pre-workout → log 500ml
- Post-workout → log 750ml
- Evening → log 500ml
That's 2.75L without even trying. Add a few extra glasses and you're at 3L+.
The AI insights engine will flag you if hydration drops below 60% of target for 3+ days. Because your gains depend on it.