Kalm can teach you different breathing techniques.
sudo pacman -Syu cmake extra-cmake-modules gcc git make
git clone https://invent.kde.org/utilities/kalm.git
cd kalm
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make
sudo make install
flatpak install org.kde.Sdk/x86_64/5.15-22.08
flatpak install org.kde.Platform/x86_64/5.15-22.08
flatpak-builder --user --install --force-clean build .flatpak-manifest.yml
flatpak run org.kde.kalm
kalm