Totally cool with that answer, looks like the best way to begin with. Thanks Dave :-)
Just in case this helps readers, we do conduct several “challenges” like that one, every year, in our office, and we use:
- a Google Spreadsheet to record monthly weigh ins.
- this Tanita BC 601 scale (http://amzn.to/2ue8Xha)
It gives a fair approximation to body fat percentage (Tim Ferriss will say the contrary, and will propose an overkill method instead ;-).
And it’s easy to use in the office (you just need to go barefeet)
We don’t track the lowest %bodyfat, but instead we give a prize to the one that lowers his %bodyfat the most ;-)
It is an amazing way to motivate people, because you spend 8h/day and have lunch with all your competitors ;-)