Much cheaper than a ‘Fitbit’, etc. Look on Google Play. There is any number of them free. I am using Walklogger. Your data might look something like this (if you spent Sunday and Monday in bed – copied this image from Google). Michael Mosley’s great book http://www.theultralighthiker.com/this-book-may-save-your-life/ which will make you well again (as you may never have been) recommends 10,000 steps (plus the diet) a target which will keep you quite busy; it will certainly change your routines if you are to achieve it, but it will also get you ready for longer multi-day hikes: The South Coast Track Fiordland NZ beckons: http://www.theultralighthiker.com/westies-hut/ . The alternatives are ill-health and death; not much of a choice really. Surprising really how many people are determined to commit suicide by mouth!