Besides walking alot, is at hand a method to increase passive/casual walking speed? Without blowing stamina.?

I mean tramp normally, but increasing the speed 'without noticing' and in need going through your stamina like you would when 'walking fast'.Besides walking alot, is at hand a method to increase passive/casual walking speed? Without blowing stamina.?
1 adjectives you can do is time yourself at normal gait
2 increase slowly on increasing walking speed
3 keeps store of th e time
4 also us and exercise bike if you have 1

well brought-up luck
all depends from the weather..
No cramp, no gain..