Yes, you really do have to run that slow.
The first honest Zone 2 run is humbling: the pace feels like a shuffle, your watch keeps telling you to ease up, and runners you used to pass drift by. That’s not a bug in the method. It’s the method.
Your easy pace is probably too fast.
This is measured, not folklore: athletes systematically run easy days harder than their coaches planned, while elite endurance athletes keep about 80% of their training at low intensity — Seiler’s review notes elite Kenyan runners do roughly 85% of their weekly kilometers below lactate-threshold pace. The best runners in the world run slow most of the time. Their slow is faster than ours, but the effort is the same: conversational.
The payoff for training that way is real. In recreational runners, an easy-dominant, polarized 10 weeks improved 10K times more than threshold-heavy training. Slower daily runs, faster race times.
Running uphill is harder work at the same pace, so your heart rate climbs with the road. Shorten your stride or walk the steep parts — the zone is the workout, not the pace.
In hot conditions your heart rate rises continuously at the same workload, and losing more than ~2% of your body mass to sweat pushes it higher still. Summer Zone 2 means running slower, and that’s correct, not weak.
If running any slower isn’t possible, alternate running and walking. Coach Jeff Galloway has built an entire method on planned walk breaks to manage fatigue — and capping your effort is exactly what keeps your heart rate in the zone.
Pace lies. Your heart rate doesn’t.
A pace that was Zone 2 in October is Zone 3 in July; a flat-road effort becomes threshold on a hill. That’s why Zone2 keeps your current zone on your wrist and taps you the moment you drift out — so “run easy” stops being a guess.
Your watch taps you the moment you leave the zone.
Your current zone stays on your wrist for the whole workout. If your heart rate climbs too high, a tap brings you back — no bad news waiting at the end.
Slow down. Level up.
Zone2 is free. Set a weekly Zone 2 goal, run by feel with your watch as a backstop, and see every easy mile actually count.