Forerunner 70
Garmin Forerunner 70 is a watch from 2026, sitting in the budget band at an indicative $249.
It reads 16 of the 33 signals this comparison tracks. Nothing at all from body composition. Rarer readings it does take: Body Battery.
By sensor class: 10 at high accuracy and 3 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, an optical blood oxygen sensor, a GPS receiver, a barometer and an accelerometer. Blood oxygen is a spot reading you take yourself, not a continuous one.
Its 13 days per charge are the 50th longest of the 80 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Built-in GPS. Rated 5ATM / 50m, fine for swimming. It weighs 40 g. Case size 43mm. No subscription is required.
Entry-level runner from May 2026, above the Forerunner 55 it replaces. Adds Training Readiness over the Forerunner 165 but has no barometer, so no floors climbed.
Key specs
What it tracks
Heart & vitals
Sleep
Activity
Fitness
Sources
https://www.garmin.com/en-US/p/forerunner-70/https://www.dcrainmaker.com/2026/05/garmin-forerunner-70-170-in-depth-review.html
Buying for battery life? See every device ranked by battery life
Your wearable's data, read against your own normal
MyBodyAI reads COROS, Garmin, Oura, Polar and Withings by logging in, and Fitbit and Pixel Watch through Google Health. Older Garmin history comes from a data export. It learns how you usually sleep and what your resting heart rate usually is, and every day shows where you stand against yourself: recovery, sleep, load and immune scores, a biological age estimate and early warnings. Optional, and separate from this comparison.
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