Focusing on breathing itself.. there's is many different techniques, but you could develop your own also with time.
Yesterday was noting with @bohemia about it.. nostr:nevent1qqs97ca6cach0nryyn6jx2fj84s0lsh0j9lt283zyxn3wgw40f4pjygprfmhxue69uhkummnw3ezuargv4ekzmt9vdshgtnfduhsygygv7ldj05fey7smzkf3vjy8324g7v7mwgeqdrfg6cjuql3xejy2qpsgqqqqqqsk645aa