The Format
A typical hot yoga or Bikram class runs 60-90 minutes in a room held between 35°C and 40°C. The cardiovascular demand is moderate - nothing like a hard run - but the sweat losses can be substantial because the body is shedding heat into a warm room rather than into cool air. Many practitioners lose 0.5-1.5 litres of fluid in a single class.
Why It Matters Differently from Running
Runners losing a litre per hour are also producing heat at a high metabolic rate. Hot-yoga sweat losses are largely environmental - the heat is coming from the room, not the body's exertion. The implication is that fuelling (carbohydrate during the session) isn't the priority; fluid and minerals are.
Practical Approach
Arrive topped-up - drink steadily through the morning before an evening class. During class, smaller sips of water tend to be more comfortable than big slugs, particularly during inversions and prone postures.
Post-class, an electrolyte product earns its place. The format doesn't matter much - a Hydralyte tablet, a Dr.Hydrate sachet, or a sugar-free Powerade Zero all do the basic job of replacing sodium and fluid. The sodium-on-the-higher-end products (LMNT) suit people who sweat heavily and feel under-replaced afterwards.
Listen to the Body
Headaches, salty-tasting sweat residue on the skin, and a tendency to feel a bit flat the next morning can all suggest you're under-replacing on hot-room days. If you're new to the format, build a hydration habit around the practice rather than treating it as ad-hoc.
Frequently Asked
Do I need electrolytes for hot yoga?
Helpful post-class for most regular practitioners. The sweat losses in a hot room (35-40°C) are comparable to endurance training even though the cardiovascular load is lower.
What should I drink during hot yoga?
Small sips of water through the class - bigger sips can be uncomfortable during inversions and prone postures. Pre-hydrate steadily through the day before.
Which electrolyte product suits hot yoga?
Any sodium-containing post-class drink works. Tablet brands (Hydralyte, Nuun) and sachet brands (Dr.Hydrate, LMNT for heavier sweaters) all do the basic job.
