Had one going for April and I think it helped a bit.
Basically anything you like once it gets you walking more than you are currently doing!
I have a Fitbit and am aiming for 10,000 steps a day.
I also use MapMyWalk and have a loop I do that is 4km. For the first week I am aiming to do that every day. After that I will increase.
I read on another thread that 15,000 steps a day is needed for weight loss so I'm aiming to get to that by the end of the month.
Hoping for some company again!