Walking is free, requires little equipment other than a good pair of shoes
and some loose clothing and has been proven to have a positive effect
in weight loss and reducing mortality from heart disease. One limitation
with walking is the length of time required to 'burn' sufficient calories.
Walkers typically burn between 300 and 500 K/cal per hour - this equates
to about 10 hours of walking to burn one pound. Walking by itself will
probably have little effect as a weight loss technique, but it is definitely
a 'step' in the right direction.
Comfort. If you are not in a comfortable environment and don't have a comfortable exercise mat it will give you another excuse not to work out. So, be sure to get the right fitness mat, yoga mat or pilates mat... whatever is best suited for you.