Activity
How many steps a day do you really need?
Why 10,000 is not a universal prescription—and how to use your baseline instead.
Read the evidence-linked answer →Til100 Blog
Health data, explained for real life.
Clear, source-linked answers to everyday questions about movement, recovery, and long-term patterns. Each guide begins with what the evidence supports, then explains its limits and one practical next step.
Heart & recovery
What does HRV mean?
What one reading can tell you, what it cannot, and why your own trend matters most.
Read the evidence-linked answer →Every guide should earn your trust.
We name the research, separate a single reading from a sustained pattern, and explain what Til100 can—and cannot—infer for you. Each guide is reviewed when stronger evidence becomes available.