Signed in 1840, the Treaty of Waitangi is an agreement between the British Crown and Maori. Around this time, there were 125,000 Maori and about 2000 settlers in New Zealand. Sealers and whalers were the first Europeans settlers, followed by missionaries.
Their male subjects burned 105 calories running, 52 walking; the women, 91 and 43. That is, running burns twice as many net calories per mile as walking. And since you can run two miles in the time it takes to walk one mile, running burns four times as many net calories per hour as walking.
Each mile that a person walks burns roughly 100 calories. If a person was to commit to walking 4,500 extra steps per day, or roughly 3 extra miles, they would be burning an extra 300 calories a day (at least). Burning 300 calories each day leads to a weekly deficit of 2100 calories.