target heart rate

I'm a 29 year old woman. Not in the greatest shape sinse I had my baby and hysterectomy. At rest my heart rate is between 85-100. I know when you excersise you want to get your heart rate up, but how much? I want to start doing some running again and more arobics. I have never pushed myself too hard before, so my heart rate never got that high. But I feel ready to kick up my routien a notch or two. What happens when you get your heart rate up too high?
thanks everybody

[live4fitness]

I would recommend calling your Dr and asking. Your heart rate will go down as you excersise more.

Example- When I went in for a stress test, since I work out, it took a while to get my heart rate up to 150 which is what they wanted

[hockeycrazy3033]

Nalla, from what I've been told in school and from research on the internet your THR should be somewhere in the late 90's to mid 100's.

Here's a site:

http://www.healthatoz.com/healthatoz/Atoz/tl/cl/thr/calone.jsp?age=29

I put the age for you. Hope it helps!