Freiwasserschwimmer beim Sighting im offenen See (KI-generiertes Beitragsbild)

2026-07-12

No Line. No Wall. Your Plan for the Open Water

AUTHOR:

Sonja Höslmeier

6 min read

You emerge from the indoor pool convinced you can swim. Then you hit the lake, the waves slap you in the face, and suddenly there’s no lane line to tell you which way is forward. That moment reveals exactly what your swim training is really worth.

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Quick Sprint

▸ Sighting only briefly lifts your head without disrupting your rhythm
▸ Cold adaptation can be trained, but the initial cold shock shouldn’t be underestimated
▸ A wetsuit provides warmth and buoyancy but noticeably alters your stroke
▸ Buoys, a buddy, and fixed landmarks are mandatory, not optional extras

Why the lake outsmarts your indoor-pool brain

In the pool you see the black lines and know the wall is 25 or 50 metres away. You can push off, stop, or simply change direction. In a lake or the ocean, all that disappears. No bottom, no lane lines, often poor visibility, and a surface that’s constantly moving.

On my first attempt I’d gone about 80 metres before I started to doubt which way I was swimming. I tried to follow the sun and ended up almost parallel to the shore. It wasn’t a fitness issue-it was because I’d relied entirely on visual cues that simply don’t exist in open water.

That’s the real transfer for your training. You build better body awareness and learn to hold a course without constant feedback. That makes you more efficient in the pool because you correct less. At the same time, you become more resilient when conditions aren’t perfect. Swimmers who train only in calm water are often unpleasantly surprised on their first lake or sea swim.

Sighting: Lift your head without losing momentum

Sighting is when you briefly lift your head out of the water while swimming to check your direction. The key is to do this without disrupting your rhythm. Use the momentum from your underwater pull, lift your head just enough to see over the waves, lock onto a target, and immediately return your head to the water.

At first, I’d jerk my head up like I was doing breaststroke, nearly coming to a halt each time. Each sighting cost me several seconds and a lot of energy. It’s better to integrate the lift into your normal stroke cycle. A good rule of thumb: check your direction every six to ten strokes. More often in rough water, less frequently in calm conditions.

For your own training, the difference is immediately noticeable. Swimming in a straight line saves distance. In a 1.9-kilometre triathlon, that could easily be 100 to 200 metres you’d otherwise waste zigzagging. Your heart rate stays lower, you burn less energy, and you save more for the bike and run. It’s not a minor bonus-it’s a real competitive edge.

Breathing when the water isn’t still

In a pool, you can breathe whenever you like-the surface is smooth and your rhythm is steady. In open water, timing becomes a real challenge. Waves roll in unpredictably, and if you breathe at the wrong moment, you’ll swallow water or break your stroke.

The practical fix is to breathe on the leeward side and keep your head slightly lower when a wave approaches. Wait until the wave has passed halfway before inhaling. It’s crucial to exhale continuously underwater; if you don’t, you’ll surface frantically and lose your bearings.

The benefits carry over to the pool and race day. You’ll become less dependent on perfect conditions. Many who swim regularly in open water report that their breathing in the pool becomes calmer and more even. They stop fighting the water and start working with it instead.

Cold and cold shock: The first minutes decide everything

The real danger at the start isn’t the lingering cold-it’s the cold shock in the first 30 to 90 seconds. Your body reacts with a sudden gasp reflex and a spike in heart rate. Many underestimate this and dive straight into deep water.

On my first real attempt, after about 20 seconds I felt like I couldn’t get enough air. That’s normal. Your body needs time to adjust. So enter the water slowly, give yourself one to two minutes, and only then begin swimming.

Over time, you’ll adapt to colder water. Most athletes manage significantly longer sessions at lower temperatures after four to six weeks of regular short swims. This adaptation makes you more resilient in chilly pool sessions or races with fresh water. Your nervous system learns not to panic instantly.

Wetsuit: When it actually makes sense

A wetsuit keeps you warmer and adds buoyancy. You float higher, reduce drag, and burn less energy. For swims over 30 minutes or water below 18 °C, it’s a clear advantage for most athletes.

The catch is that the suit changes your stroke. Shoulder rotation becomes less free, and some feel a slight restriction. If it’s not a perfect fit, it can chafe at the neck or arms. It also needs time to settle properly.

The honest approach is to train both ways. A few sessions without a wetsuit keep your feel for the water sharp. For longer or colder swims, use it to stay safe and go farther. In races, it’s often mandatory or simply the smarter choice. You pick based on conditions, not habit.

Buoys, buddies and landmarks: your real safety net

There’s no lifeguard on open water. You’re responsible for your own safety. Towing a bright swim buoy behind you makes you visible to boats and others. In an emergency it also gives you buoyancy without extra effort.

Never swim alone-not even if you feel fit and the distance is short. A buddy, or at least someone on shore who knows when you should return, is mandatory. Before you start, pick two fixed landmarks-say, a distinctive tree and a house on the opposite shore. That way you swim straight instead of ending up going in circles.

This discipline carries over directly to the rest of your training. You’ll plan sessions more precisely and learn to take responsibility for yourself. Exactly the skills that help on longer adventures or races where you’re on your own.

How to get started

Choose a familiar, safe entry with a shallow shore and good visibility.
Start with 5–10 minutes without a wetsuit so you feel the cold shock and disorientation.
Practice sighting first in the pool: swim normally and lift your head during the stroke to lock onto a target.
On the lake, mark two landmarks and swim 50–100 m straight toward them.
Always take a swim buoy and plan the session with a buddy or at least someone who knows your plan.
Increase distance only when you feel in control after every single session.

Bottom line

Moving from pool to open water exposes every gap in technique and mental toughness. Practising there makes you more efficient in the pool and calmer in windy or cold races. That’s the concrete payoff for your own training.

Cool-down

Click on a question to reveal the answer.

How often should I look up during sighting?

In most cases, every six to ten strokes is enough. In rougher conditions, check more frequently. In calm waters, you can go 12 to 15 strokes before taking a quick look.

Do I really need a wetsuit when I’m just starting out?

Not for short sessions under 20 minutes in water above 18 °C. For longer swims or cooler water, it’s a real safety boost and saves energy.

What should I do if I suddenly feel panic?

Stop paddling, roll onto your back, and breathe consciously. The buoy will keep you afloat. If that doesn’t help, swim slowly and steadily back toward shore without panicking.

How do I find good entry spots near me?

Check local swimming groups or triathlon clubs. Many organize regular open-water meet-ups at well-known lakes. There you’ll learn the safe spots and get practical tips from people who’ve been doing it for years.