Wild (Open-Water) Swimming
Swimming in lakes, rivers or the sea.
How to start
Start in a supervised venue or with an experienced group, in warm water and calm conditions. Wear a bright swim cap and a tow float, and wear a wetsuit if the water is cool.
How to progress
Add time in the water slowly. Practise sighting (looking ahead) and getting in and out safely. Take more care as temperatures fall.
What the evidence says
Evidence: limited
We found no strong trials on open-water swimming for health. General swimming is linked to health benefits (see Lap Swimming). A 2026 meta-analysis of cold-water exposure studies (13 studies, 4,105 people) found some signs of better mood, but confidence ranges were wide and most studies had a high risk of bias. So the extra benefits are unproven.
Take care: Cold water shock, currents and hidden hazards are real risks. Never swim alone, always tell someone, get out early if you feel cold or tingly, and avoid alcohol. Check with a GP if you have a heart condition or high blood pressure.
Sources
12-week starter plan
You need to swim confidently in a pool first. Build up gradually in warmer months, and go with others.
Tick each week as you finish it; your ticks are saved on this device only. Repeat a week if it felt hard. Weeks 4, 8 and 12 hold steady so you can settle. This is a general plan, not medical advice.
Add reminders to your calendar
Pick your days and time. You will download a calendar file that adds 12 weeks of reminders to Google, Apple or Outlook calendar.
Calories and weekly minutes
Enter your details for a rough estimate. Based on about 7 METs (Open-water swimming at a steady pace (estimated)). Real figures vary by 20% or more between people.
Tips and common mistakes
Tips
- Swim with a buddy or a group, and use a tow float.
- Warm up gradually: do not dive in.
- Have warm clothes and a hot drink waiting afterwards.
Common mistakes
- Swimming alone.
- Jumping straight into cold water.
- Staying in too long when your hands go numb.
Kit and cost
Low to moderate Approximate UK prices.
- Swimsuit, goggles and a bright swim cap (about £25 to £50)
- A tow float (about £20 to £40)
- A wetsuit for cooler water (about £80 to £300)
- A changing robe and a flask
Frequently asked questions
Is open-water swimming safe?
It can be, with preparation. Swim with others, in places with lifeguards when possible, and learn about cold water shock.
Do I need a wetsuit?
Not in warm water, but a wetsuit helps in cooler conditions, and brings extra buoyancy.
Does wild swimming improve mood?
Some people feel it does, but the studies are limited and at high risk of bias, so it is not a proven treatment.
Good for: Heart & fitness Mood & stress Fun & social
Compare with similar options
| Wild (Open-Water) Swimming | Surfing | Kayaking and Canoeing | Dragon Boat Racing | |
|---|---|---|---|---|
| Typical session | 30 min × 2/wk | 90 min × 2/wk | 90 min × 1/wk | 60 min × 2/wk |
| Effort | ●●●○○ | ●●●○○ | ●●●○○ | ●●●○○ |
| Cost | Low cost | Moderate cost | Moderate cost | Low cost |
| Equipment | Basic kit | Specialist kit | Specialist kit | Some equipment |
| Impact | Low impact | Low impact | Low impact | Low impact |
| Fitness needed | Some fitness | Moderate fitness | Some fitness | Some fitness |
| Evidence | limited | limited | limited | limited |