Aspire guide
Hydration
Hydration manual
Hydration by Body Weight: A Practical Fluid Math Guide for Runners
A bodyweight-based approach to hydration for cross country and track runners, with simple fluid math, a urine color chart, electrolyte guidance for hot days, and an altitude adjustment.
Why this matters
"Drink more water" isn't wrong, exactly — it's just not specific enough to be useful.
Read time
8 min
Audience
Coach + Parent
Use it for
Hydration
Start here
Body-weight hydration math sets the baseline; practice losses, sodium, and urine color finish the plan.
Coach prompt
Is this athlete missing the daily baseline or the practice replacement target?
Quick reference
Topic snapshot
Key action
Hydration by Body Weight: A Practical Fluid Math Guide for Runners
Read time
8 min
Audience
Coach + Parent
Start here
Body-weight hydration math sets the baseline; practice losses, sodium, and urine color finish the plan.
Best next move
Use it this week
Is this athlete missing the daily baseline or the practice replacement target?
Quick reference map
Use the topic like a clear checklist
In the library
Format
Read the topic here, then download the PDF only when you need an offline copy.
Best use
Open the sections you need, then share the same topic link with coaches, parents, or athletes.
Quick start
Start here
A bodyweight-based approach to hydration for cross country and track runners, with simple fluid math, a urine color chart, electrolyte guidance for hot days,…
Baseline
Use body weight to set the normal day target
- Daily baseline runs about 0.5-0.7 oz per pound of body weight.
- A 130-pound athlete starts around 65-90 ounces on a normal day.
Training add-on
Practice losses stack on top of the daily baseline
- Add 12-20 ounces per hour of practice, more in heat.
- A hot 90-minute practice can push the day well past baseline.
Make it real
Split the target across the day
- Morning bottle, school bottle, practice bottle, dinner fluids.
- A big evening catch-up usually means the plan was too vague.
What coach says
"Hydration is a daily habit, not a five-minute chug before warmup." The number-one correction coaches need to make is timing: athletes who show up dehydrated and try to fix it…
Hydration is a daily habit, not a five-minute chug before warmup." The number-one correction coaches need to make is timing: athletes who show up dehydrated and try to fix it with a big gulp of water right before practice haven't actually solved anything — that fluid hasn't had time to be absorbed and distributed…
Field use
A field protocol coaches can actually repeat
Morning
Check the athlete before practice starts
Dark urine, headache, and an empty bottle are red flags before the session even begins.
During training
Use planned drinking moments
Scheduled drink breaks beat thirst when the day is hot, dry, or altitude-adjusted.
After practice
Replace losses steadily
Push recovery fluids across the next few hours instead of one rushed bottle.
Unlock the rest of the manual
Full access opens every section and the ebook PDF.
What to do next
Use it this week
Is this athlete missing the daily baseline or the practice replacement target?
Source topics
hydration by body weight • how much water should a runner drink • sweat rate calculation athletes • urine color chart • electrolytes hot weather running • athlete hydration formula