Comfort routine, not treatment. Nothing here should hurt. If something does, stop that one.
Open one to watch it and read what it's for. Try it plays just that one, at your dose, and it counts toward your history.
strch builds the shortest stretch routine you will actually do, from a few answers about you and your day. It is a comfort routine, not treatment.
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strch is free software. You can share it and change it under the terms of the GNU General Public License, version 3, as published by the Free Software Foundation.
It comes with no warranty, to the extent the law allows. It is provided as is, and you use it at your own risk. Sections 15 and 16 of the license say this in full.
Read the license: the full GPL version 3 text, or the same text at gnu.org.
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Nothing should hurt or tingle. If something does, skip that one.