Heat: Your Secret Weapon in Disguise
Most runners dread summer. They should not. Heat training is one of the most potent legal performance enhancers available, and understanding why starts with cardiac drift -- the phenomenon where your heart rate climbs steadily even though your pace stays the same. In heat, your body diverts blood to the skin for cooling, leaving less for your working muscles. The heart compensates by beating faster. A run that feels like easy pace in 12C suddenly registers as tempo effort at 30C. Here is the rule of thumb: for every 5C above 15C, expect a 1-2% pace slowdown at the same effort. That means a 5:00/km easy pace might legitimately become 5:15-5:30/km on a hot day, and that is not a sign of lost fitness.
Now the good news. After 10-14 days of consistent heat exposure, your body undergoes heat acclimatization: plasma volume expands, sweat rate rises, sweat becomes more dilute (conserving electrolytes), and your core temperature at rest drops. You become a more efficient cooling machine. These adaptations transfer directly to cool-weather racing -- more plasma volume means more stroke volume, which means a lower heart rate at the same pace. Runners returning from summer training blocks often set personal bests in autumn races without understanding why.
The danger signs are non-negotiable: confusion, disorientation, or stumbling are medical emergencies. Get them into cold water -- a tub, a lake, an ice bath, whatever is closest -- and keep them in it while help is on its way. Cool first, transport second: the ambulance ride is not the treatment, the water is. Do not wait for the skin to go dry -- exertional heat stroke usually arrives hot and sweaty, so a runner who has stopped making sense is the emergency, sweating or not. Practical strategies include shifting runs to early morning, slowing down without guilt, and planning routes with water access. Coach Steev's effort-based training plans shine here -- follow perceived effort, not pace, and let the heat do its invisible work.
Cold: Debunking Myths and Running Through Winter
The biggest misconception first: cold air does not damage your lungs. By the time inhaled air reaches your lower airways, your body has warmed and humidified it to near body temperature. The burning sensation you feel is your upper airway doing its job, and it is uncomfortable but not harmful. Runners have safely trained in temperatures well below -20C with proper preparation.
What cold actually does is more subtle. Muscles contract more slowly when cold, and connective tissue loses elasticity. This is why a 10-minute warm-up in summer might need to become 15-20 minutes in winter -- starting with brisk walking, then gradually building to run pace. Skip this and you are asking stiff, reluctant tissue to perform explosive work.
Cold also changes your fuel economy. Your body burns through glycogen faster in cold conditions because shivering and maintaining core temperature are metabolically expensive. Longer winter runs may require fueling earlier than you are used to. Pay attention if you hit a wall sooner than expected -- it is not just the dark mornings killing your motivation.
Layering follows one principle: manage moisture, block wind, avoid cotton. A synthetic or merino wool base layer wicks sweat, a wind-resistant outer layer shields exposed skin, and cotton -- which holds moisture against the body -- is genuinely dangerous in cold. Extremities lose heat fastest, so a hat and thin gloves make a disproportionate difference. Generally, dress for 10C warmer than the actual temperature, since running generates significant heat. When does it become too cold? Below about -27C with wind chill, exposed skin can freeze in roughly half an hour, and that is where the cold-injury guidelines start calling for real vigilance. Use a neck gaiter or balaclava, and consider a treadmill as the genuinely smart option.
Altitude: Less Oxygen, More Adaptation
At 1,500 metres above sea level, air pressure is about 17% lower than at sea level, so every breath delivers proportionally less oxygen. At 2,500 metres, the pressure drop is closer to 26%. Your body notices immediately: heart rate rises, breathing deepens, and paces that felt easy at home become genuinely hard. The first 48 hours at altitude are the worst -- your body has not begun adapting, but it is already oxygen-deprived. This is the window where runners most commonly make the mistake of pushing through a planned workout and digging themselves into a hole.
Full acclimatization takes 2-3 weeks. During that time, your kidneys produce more erythropoietin (EPO), stimulating red blood cell production. Your muscles develop more capillaries and become more efficient at extracting oxygen from blood. After three weeks at moderate altitude (1,800-2,500m), many runners return to sea level with a measurable boost in oxygen-carrying capacity that lasts 2-4 weeks -- the principle behind altitude training camps used by elite athletes worldwide.
If you are travelling to race at altitude, more time helps, and it helps in a straight line. Two weeks is where most of the available adaptation has landed and where the best-practice recommendation sits; a week still buys you a real share of it; and even two or three days beats stepping off the plane on race morning. Arriving hours before the gun is the cheapest option logistically, not the cleverest -- your first day at altitude is usually your worst. Whenever you arrive early, keep the first two days easy: hard training before your body has started adjusting buys you fatigue, not fitness. Expect to run slower at any given effort at moderate altitude than at sea level, even when acclimatized. Adjust your goal pace accordingly, and rely on perceived effort rather than your GPS watch. Coach Steev's plans work well here because they are built around effort, not rigid pace targets -- critical when the altitude is silently rewriting what every pace means for your body.
Rain, Wind, and Storms: When to Embrace It and When to Bail
Rain is almost never a reason to skip a run. Once you are wet, you are wet, and the psychological barrier of stepping out the door is usually worse than the run itself. A light rain can actually make summer runs more pleasant by providing natural cooling. The real enemy is not water -- it is chafing. Apply anti-chafe balm to inner thighs, underarms, and anywhere a seam meets skin before rainy runs. Wear a brimmed cap to keep rain out of your eyes, and choose shoes with good drainage rather than waterproof models that trap water inside.
Wind changes running economy significantly. A direct headwind makes the same pace cost more energy. Air resistance climbs with the square of your speed through the air rather than your speed over the ground, so a headwind adds far more than its number on the forecast suggests. Running into strong wind should feel like running uphill -- slow down, shorten your stride, and lean slightly forward. If you are running an out-and-back route, start into the headwind so you get the tailwind benefit when you are fatigued. On group runs, tuck in behind another runner and let them break the air for you -- a technique borrowed from cycling that works just as well on foot.
There are exactly two weather conditions that should cancel a run outright: lightning and ice. If you can hear thunder, you are within striking distance. Get indoors. Black ice is invisible and unforgiving -- a broken wrist from a fall costs you more training time than one missed run ever could. Moderate wind, rain, or even snow are all runnable conditions. Build the habit of going out anyway, and you will develop a mental toughness that pays dividends on race day when conditions are not perfect -- and they rarely are.
Adjusting Effort: Why Conditions Make Pace Meaningless
Here is the central truth of running in variable conditions: your GPS pace is a measurement of speed, not effort. A 5:30/km in 30C heat and 80% humidity might represent the same internal workload as a 4:50/km on a crisp autumn morning. If you stubbornly chase the same pace number in both conditions, you will overtrain in summer and undertrain in winter. Neither is what you want.
This is where perceived effort becomes your most reliable training tool. Rate your effort on a simple scale: can you hold a full conversation (easy), speak in short sentences (moderate), or only manage a few words (hard)? This internal gauge automatically accounts for heat, cold, altitude, wind, humidity, sleep quality, and accumulated fatigue -- variables that no watch algorithm fully captures.
Coach Steev's training plans are designed with this principle at their core. When your plan calls for an easy effort day, it means easy effort -- whatever pace that translates to in today's conditions. On a hot, humid afternoon, that might be a full minute per kilometre slower than your cool-weather easy pace, and that is exactly right. The physiological stimulus you are targeting -- aerobic development, recovery, or threshold work -- is determined by internal effort, not external speed.
Practically, this means logging conditions alongside your runs. Note the temperature, humidity, wind, and altitude. Over weeks and months, you will build a personal database of how your body responds to each variable. You will stop panicking when summer paces look slow, and you will recognize that a slow hot run and a fast cool run often represent identical fitness. The runners who understand this train consistently through every season. The runners who chase numbers burn out in summer and wonder why their autumn race did not go to plan.
Building a Year-Round Condition Strategy
The smartest runners do not just survive adverse conditions -- they periodize around them. If you live somewhere with distinct seasons, you have a built-in training advantage that most people waste.
Summer heat maps perfectly onto base-building and Build phases. The combination of higher training volume and heat stress produces a double adaptation: aerobic fitness improves from the training, and plasma volume increases from the heat. Runners who maintain consistent summer training -- at appropriately reduced paces -- arrive at autumn with a cardiovascular system that has been quietly upgraded. This is why so many marathon personal bests happen in October and November.
Winter suits threshold and speed work. Cool, dense air means more oxygen per breath, and your body wastes less energy on cooling. Interval sessions that felt impossible in July become surprisingly manageable in January. The trade-off is shorter daylight and cold-stiffened muscles, so invest in reflective gear and thorough warm-ups.
Altitude, if accessible, works best as a 2-3 week training block during your Build phase, returning to sea level 1-2 weeks before a target race to capture the red blood cell boost while it is still active.
The thread connecting all of this is consistency over perfection. A runner who trains 48 weeks a year at adjusted effort across all conditions will always outperform one who only runs when the weather is ideal and loses months of training to skipped sessions. Every condition teaches your body something different -- heat teaches it to cool, cold teaches it to conserve, altitude teaches it to extract, and wind teaches it to persist. Accept the slow paces on hard days, appreciate the fast paces on easy days, and trust that your body is keeping an honest ledger of the work. Coach Steev's plans adapt to this philosophy: consistent effort, every condition, every season.