Hi Kathryn
My training is with a 5.5kg BackPack,
12.76km Sunday / 11.3km Monday (today) ...
my average was 7.6km x 5 days a week since last December.
This includes 200mtrs + of elevation (4 hilly Sydney suburban streets).
I plan on building this up to 16km x 3 consecutive days (twice a week)...