Why Heart Rate Zones Matter More in the Highlands

Running here is rarely flat. A forest track that climbs gently for two miles, a stony path up a glen, a coastal trail with a stiff westerly behind you — all of it pushes the heart rate up whether you meant it to or not. That's the trap. Most of us end up running our easy days too hard and our hard days not hard enough, and the terrain quietly encourages it.

Heart rate zones give you a simple, honest language for effort. They let you say "today is a Zone 2 day" and mean it, even when the ground under your feet is arguing otherwise. Used sensibly, they'll improve your endurance, keep you fresher for the big days out, and reduce the nagging injuries that come from doing everything at the same medium-hard pace.

The Five Zones, Translated Into Feel

Zones are usually worked out as a percentage of your maximum heart rate. Here's what they mean in practice:

• Zone 1 (50–60% of max): Very easy. A recovery shuffle, a warm-up, a chatty jog along a flat loch-side path. You could sing, badly.
• Zone 2 (60–70%): Comfortable and conversational. Full sentences without gasping. This is where most of your weekly mileage should live.
• Zone 3 (70–80%): Steady and purposeful. Short sentences only. Useful in small doses, but easy to drift into by accident on a climb.
• Zone 4 (80–90%): Threshold effort. Breathing hard and rhythmic, a few words at a time. Sustainable for roughly 20 to 40 minutes in a race, not in training.
• Zone 5 (90–100%): Short, sharp intervals. Legs burning, breathing ragged. Seconds to a couple of minutes at a time, then recover.

As a rough guide, an easy Zone 2 run should feel almost too slow. If you're finishing your easy runs feeling like you could go round again, you're probably in the right place.

Finding Your Own Numbers

The old "220 minus your age" formula is a starting point at best — it can be out by ten or fifteen beats either way for any individual. If you want something more accurate, a field test works well.

Warm up thoroughly for fifteen minutes, then run hard up a steady climb for three minutes, jog down easily, and repeat twice more. The highest figure your monitor shows in the final minute of the last effort is a decent estimate of your max. Do this fresh, not after a long week, and never if you have any health concerns you haven't discussed with a doctor.

Then check your resting heart rate, ideally first thing in the morning before you get out of bed. With both numbers, you can set zones properly on your watch, or simply calculate them and write them on a piece of tape on your wrist — which is genuinely what several of us do.

Making Zones Work on Rough Ground

Heart rate lags behind effort by thirty to sixty seconds, so don't treat the number as an instant verdict. On a steep climb, your heart rate will keep rising even after you ease off; on a fast descent, it'll stay high while you're barely working. Judge the terrain ahead and adjust early.

A few practical habits make Highland zone training far easier:

• Walk the steep bits. On a serious climb, walking briskly will often keep you in Zone 2 while a slow jog tips you into Zone 4. Walking is not failure — it's pacing.
• Use a chest strap. Wrist sensors struggle with cold hands, hill wind and gripping poles. A strap is far more reliable.
• Expect drift. On a two-hour run, your heart rate will creep up even at the same pace, especially in cold wind or on tired legs. Aim for a range, not a single number.
• Do intervals on forgiving ground. A flat forest track or a smooth riverside path lets you hit Zone 5 safely. Save the technical trails for easy days.

A Week That Works Around Highland Weather

A sensible pattern might look like this: two easy Zone 2 runs on flatter routes, one tempo session of twenty minutes in Zone 3 to 4, one set of short Zone 5 intervals, and a longer weekend run on trails, mostly easy with some hills. If the forecast is grim, swap the interval session for the easy day and keep the quality work for a calmer window.

On long trail days, cap the effort at Zone 2 for the first half and let it drift into Zone 3 later if you feel good. That discipline is what builds the endurance to enjoy a full day in the hills rather than merely surviving it.

Watching Progress Over Months

The real value of a monitor is the long view. Track three things: your resting heart rate, the pace you can hold at a given heart rate, and how quickly your heart rate settles during recoveries. Over eight to twelve weeks, you should see the same pace at a lower heart rate, or a faster pace at the same one. Resting heart rate often drops by a few beats too.

Don't chase daily numbers. A bad night's sleep, a cold, a stressful week at work or a plate of chips the night before will all shift things. Look at monthly trends and trust the feel of the run alongside the data. The zones are there to serve your running, not the other way round.