Case studies
1st
RunningUltra
4th May, 2026
Cocodona 250
Rachel Entrekin
409.0km
56hrs 9mins
Mild, Rain
Carb per hour: 49g
Sodium per hour: 446mg
Fluid per hour: 341ml
Relative sodium concentration: 1306mg/L
View Rachel's Numbers1st
RunningUltra
4th May, 2026
Cocodona 250
Rachel Entrekin
409.0km
56hrs 9mins
Mild, Rain
Carb per hour: 49g
Sodium per hour: 446mg
Fluid per hour: 341ml
Relative sodium concentration: 1306mg/L
View Rachel's Numbers3rd
RunningUltra
21st March, 2026
Ultra Trail Chianti Castles
Rachel Entrekin
120.0km
11hrs 38mins
Cold
Carb per hour: 66g
Sodium per hour: 485mg
Fluid per hour: 495ml
Relative sodium concentration: 979mg/L
View Rachel's Numbers3rd
RunningUltra
21st March, 2026
Ultra Trail Chianti Castles
Rachel Entrekin
120.0km
11hrs 38mins
Cold
Carb per hour: 66g
Sodium per hour: 485mg
Fluid per hour: 495ml
Relative sodium concentration: 979mg/L
View Rachel's Numbers1st
RunningUltra
8th November, 2025
Pass Mountain 50 mile
Rachel Entrekin
80.0km
8hrs 23mins
Mild
Carb per hour: 70g
Sodium per hour: 466mg
Fluid per hour: 1,037ml
Relative sodium concentration: 450mg/L
View Rachel's Numbers1st
RunningUltra
8th November, 2025
Pass Mountain 50 mile
Rachel Entrekin
80.0km
8hrs 23mins
Mild
Carb per hour: 70g
Sodium per hour: 466mg
Fluid per hour: 1,037ml
Relative sodium concentration: 450mg/L
View Rachel's Numbers