Toprol-XL and weight training

HI, I was prescribed IC Metoprolol succ er 25 mg. same as Toprol xl. I feel tried, I am a fitness instructor and teach 13 classes a week. 8 aerobic and 5 weight training classes. I continue to gain weight. With this being a blocker, I have just come to find out this med wont let you heart rate go up when you exercise so you muscles can get oxygen and burn fat. The lack of oxygen makes you (us) more tried less motivated to workout or anything for that matter. It has effected me in this matter. I am calling my doctor to change my meds. this website was great. I new It had to be my meds, you don't workout this way and still gain weight!!!!!!!! I have always been very fit and muscular, something i took pride in. now I"m looking flabby. It"s really hard for me. Hard to motivate people when you don"t look like things I share with people all the time. hang in there the weight will come off just be consistent, when I continue to gain weight.

Weight gain and hitting the gym and treadmill 5 days a week. I'm on 150 mg Toprol @day for 4 years now, joint pain and pain in my calves. Dr. told me to cut my cal intake to 1300 calories a day and even at that not one pound lost and doing 10 miles at the very min a week on the treadmill and upper and lower body weight training. I'm at my wits end with this problem. Help Please!