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Today, 20 October
How much load you took on today, scaled to what is normal for you. Zone minutes count for more the harder they are; steps add a little.
Strain is not good or bad on its own. Read it against today's target.
load = zone minutes x [1, 2, 3, 4, 5] + steps / 1000 x 1.5 scale = 0.9 x your 28-day 90th percentile load strain = 100 x (1 - e^(-load / scale))
The same formula scores the web and iPhone apps, and it is covered by tests.
Target today 35–55%
Inside today's target of 35 to 55. Stop here or stay under 55.