Hi Lori,
I use to run 3 miles daily so I can offer you some advice.
As a beginner, you should WALK on the treadmill for 30-60 minutes only 3 days a week. It is VERY IMPORTANT to take at least a one day break in between. If you cannot tolerate 30 minutes, only do what you feel comfortable with. You should do this for at least 1 month straight. Below are the target heart rate levels for a "normal woman" at the age of 45. Sorry, to age you one more year, but I had to to figure out where you should be.
Age 45 years
Target HR (heart rate) Zone 50 - 85 % - 88 - 149 beats per minute
Average MaximumHeart Rate 100 % - 175 beats per minute
You want to make sure that you take your pulse around the middle of your workout. At that time, your heart rate is best determined. 88 bpm (beats per minute) is a low-grade, fat-burning workout - not cardio. You want your rate to be around 140. DO NOT GET UP TO 175!!! At this rate, you are pushing towards a heart attack!!! At the end of the month, if your heart rate is say 120, you can start to increase your exercise routine. If it is at 140, don't advance!!! Continue with the 30-60 minutes walks 3 days a week. YOU MUST TAKE THE DAY OFF IN BETWEEN. YOUR BODY NEEDS THAT WAS A BEGINNER!!!
As far as treadmill speeds are concerned, the first month or so (beginner), you should not exceed 3.0 - 3.2 mph. No to low incline. What I do is stretch for 5 minutes first - off the treadmill. Then, I start 2.5 minutes at 2 mph. Then, 2.5 minutes at 2.5 mph. Then, 3.0 mph for 10 - 15 minutes. Then, 3.2 mph for 30 - 35 minutes. Then, 3.0 mph for 10 - 15 minutes. Then, 2.5 mph for 2.5 minutes. Then, 2.0 mph for the last 2.5 minutes. Then, I stretch off the treadmill for 5 minutes so my muscles don't cramp up or anything, otherwise the next day will be suicide.
Once you get the first month under your belt, slowly increase the speeds of the treadmill to no more than 3.5 - 3.7. Do that speed for 1 month and so on. Once you get to 4.0 - 4.5, you are considered in the advanced group. Sport level.
Now, what you could do too once your good is walk 5 minutes, jog 1. That pattern is great too!!! That's how I got up to 3 miles a day. I would walk 5 minutes, run 15 minutes, walk 5 minutes, run 10 minutes, walk 5 minutes, run 5 minutes, walk 5 minutes, and done. That worked very well for me.
I did that for nearly 1 year. Then, my husband and I decided to try and conceive so I had to really slow it down. We never conceived....So now I am trying to get back in shape. Also, what I do is take 2 Tyenol prior to workout now since I'm beginning again too. After a few times, I won't need it. It helps me not have any bad reaction like wheezing or anything. Also, allows me to get a better level of air in and out during exercise. I take 650 mg - low dose.
Make sure to drink lots of water before and after. I get dehydrated moreso in summer. I usually down 30 oz. of water within 15 minutes of coming off.
Good luck! Keep me posted! I'll check back!<img src="i/expressions/face-icon-small-wink.gif" border="0">