Blog

What actually determines whether you finish your first marathon safely: readiness, timelines, training, tapering, and fueling — with every claim rated for how solid the evidence is.

What research on 150,000+ marathons says it takes to break 4 hours: why mileage beats genetics, a timeline by starting point, and how to build the cycle.

DFA a1 promises an aerobic threshold from a chest strap alone — but validation studies disagree by up to 28 bpm. What it gets right, and what DDFA fixes.

Bloc is a free, colorful block-grid Garmin watch face — ten recolorable metric tiles, a two-block clock, and four one-tap themes, for 100+ round Garmin watches.

What the science actually says it takes to break three hours in the marathon — the physiology, the training that works, and an honest timeline.

Heart rate zones explained: why '220 minus age' has no scientific basis, and how Karvonen, MAF, and threshold-based zones actually compare.

Dotpace is a free, minimal Garmin watch face with a 90-day Trends chart for VO₂max, Stress, Body Battery and Resting Heart Rate.

LT1 and LT2 aren't the same problem. Govern the aerobic threshold by heart rate, anaerobic by pace, with a weekly structure that makes both stick.

Heart rate stays high for hours after easy sessions. Causes: autonomic threshold, EPOC, and cross-training interference — and how to train around them.

Learn to use a training pace calculator based on Jack Daniels' VDOT formulas to calculate precise running training paces and avoid the grey zone.

How to recover after running: why sleep beats every gadget, which recovery tricks sabotage gains, and whether your watch's 'recovery hours' can be trusted.

A full evidence tour of coffee and caffeine — heart, brain, bones, muscles, sleep, stress, sport — and exactly how much is right for you, whoever you are.

What HRV (heart rate variability) is, why yours might be low, and how to actually increase it — with the evidence behind each lever, and its limits.

A science-backed plan for new runners: run-walk programs, easy pacing, injury prevention, and templates for every starting point.

Do stability shoes, arch support, or barefoot running hold up to evidence? How to choose training and race shoes—and build genuinely stronger feet.

Your lactate threshold predicts race pace better than VO₂max. What LT1 and LT2 are, how to test them, and how to push your threshold higher.

How to run faster with a lower heart rate — the physiology behind it, what actually changes in your body, and how long each adaptation takes.

What running economy is, why it can separate two runners with identical VO₂max by minutes, and the science-backed ways to improve yours.

How to actually raise your VO₂max — whatever your body or budget — and why this single number was never what decided your races.

Runima turns your smartwatch activity history into the training-load, readiness, and performance analysis serious runners act on — and it's free.