Boogitas -- Start slow but start... but don't start running an hour/day, like that
doctor said, good grief
, where did that comment come from... Anyways, go at it slow have fun... Walk outside for a change of pace too...
As the other ladies said, increase by doing more incline or faster walking... You can try high intensity interval training (HIIT)... You do HIIT by warming up for 5 mins... walk fast or do an incline for 1 minute, recuperate for 1 minute, walk faster or higher incline for 1 minute, the recuperate for 1 minute, do this for 20 minutes, then cool down for 5... Guaranteed you'll have a good workout...
Keep us posted on how it goes...