It installs straight from this page. No app store, no account, no sign-up — and it works offline in the gym. Then there is a short questionnaire inside the app: that is what I need from you.
·Free, and free forever. No account, no sign-up.
·Nothing is uploaded — your workouts stay on your phone.
·Works with no signal: basements, garages, anywhere.
·Takes 49 KB of fonts and a few hundred KB in total. It is not a heavy download.