All this sounds great, and I've considered doing the whole quantified self thing, but aside from a massive helping of motivation, how do you go about keeping tr

All this sounds great, and I've considered doing the whole quantified self thing, but aside from a massive helping of motivation, how do you go about keeping track of all the data? Are there any good data-entry applications, or do you just note the data down and transcribe it into a spreadsheet later?