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I've been having some success using TiddlyWiki to create a person offline wiki. I'm mainly using it for lecture notes from dog training conferences, but I think you should investigate it for this as well. It's small, fast, taggable, searchable, copyable to other devices (just an html file!), and you can keep individual training plans viewable in the feed to focus on while all the others are "closed" but still available as soon as you search them and click them if you want them back. Also heaps of plugins available - I found one that lets you create a visual map of all your notes and you can arrange them however you like with links between them in case you wanted to look at groupings spatially.