Why not do both ? Take your walk before you go to yoga or afterward. I routinely walk 5+ miles every day along with any classes or strength training I do. I love walking and I take yoga !
Spark People puts yoga under cardio even though it's not really cardio. It's not really strength either even though many of the poses qualify as strength type training i.e. plank, side plank, chair pose, etc... they're body weight exercises. there have been differences of opinion amongst the SP members egarding yoga. Some don't consider it strength at all. Some do.
If you just want to track the class, you'll have to track it under cardio. However, consider the class a health and fitness "bonus" because not only do you work on flexibility in a class, you also work on coordination, balance, strength and stamina too.
Edited by: ARCHIMEDESII at: 9/17/2011 (13:17)