The burn...does it really mean it's working???

Good evening friends,

I started vigorous exercising, going strong on my legs... Whew! I never knew I could rock out on a gazelle but man oh man...the burn, the burn...I forgot what this felt like. I am up to a solid 45 minute per day workout. I do a combination of things. Tomorrow (if my legs can tolerate it), I am going retro with sweatin to the oldies 3. My most favorite of all of them. Can't wait (as long as my legs can tolerate it) :) ! 

Im excited. Who does what for exercises??? Do you see results?

I  go to the gym 3 days a week i do 30 minutes on the treadmill using the c25k app,then 20 to 40 on the cross trainer and 20 on weight machines to build my abdominal muscles. I had open rny and then 9 hernia repairs and my muscles are very week still. Then i do 1 hr zumba 3 days a week.