I have a pair of Shape-Ups that I like a lot, so I was interested to try Tone-Ups. They aren't as intense as Shape-Ups, but I can tell my legs are getting more of a workout than with regular flip-flops, and they're super comfortable. For me, Shape-Ups are somewhat challenging to walk in--they really make me think about posture and footstrike--so I try to think of the terrain I might encounter when I put them on. I wouldn't wear them on uneven terrain, for example. Not so with the Tone-Ups, I've been wearing them everywhere.

A note on this particular style. I have somewhat narrow B feet, but not narrow like A, so it always comes down to the style of the shoe for me. I can't wear many Skechers styles because they're too wide. This was true for all the Tone-Up styles I tried except this one. (The others looked like flip-flops.) With the strap nearest my ankle adjusted to the tightest hole, these fit pretty well, at least for casual walking. When I wore them on a fast-paced walk with the dog, the buckle nearest my toes has rubbed at the bases of my little toes and caused blisters. I decided I won't use them for fitness walking, but they're great for around town.