Yes Heart rate is a factor, it's best to stay below 145-150, especially when first starting exercise. Start with low impact low intensity and try to only work one body area at a time, eg just legs or just arms not both. Swiming and Aqua jogging are great, but make sure it is in a heated pool, the warmer the better, use a flutter board when swiming to reduce the exhaustion. When I first stated I tried to only do 20-30mins cardio, anymore than that was too much. For me things have got better I can do higher intensity exercises and workout for longer but it took awhile to get there. Feel free to message me if you have any questions.

I am 51, have had fibro for years and got to the point where I feared exercise due to the pain I'd have afterwards. You can compare it to being beaten and covered in bruises. My ribs actually feel like they are broken, even if I touch them myself. It's awful pain and unless you have it yourself, you have no idea how bad it is.
I decided that I had to do something to lose weight, be healthier, etc. and I just started walking. Period. Walking slow enough to just enjoy the walk, yet I was doing something. At first the pain was horrible and all I was doing was walking for 30 minutes at 2mph. I would have to rub my legs afterwards because they would ache, cramp and burn for hours if I didn't. Once I found out how to relieve the pain, I kept walking. Then I set a goal to walk 'x' amount of miles for the year. Gradually the pain became less and less! It took me nearly 11 months and 1,000 miles but now I have finished C25K, I do water aerobics once a week to relax (lol) and Ive found that the pain is a lot less as long as I keep doing SOMETHING. Overdoing it is painful and I deal with it but that is what got me to where I am. She does NOT have to walk 1,000 miles, run a 5K or push herself to exhaustion. Walking alone will help her tremendously!
I will also add that before I work out, I take Tramadol, drink 2 cups of coffee and eat a banana. I know I couldn't run without the pain meds but I know I've made progress. A year ago I couldn't walk for 2 minutes without getting my pulse up to 170. Now it takes me 20 minutes of walking fast to get it up to the 120's. I will also add that after I get runner's high, I can actually do floor exercises and stretching, that I could never do, even with pain meds! I feel like it is my own little miracle.
I feel better, I've lost 40lbs and over 40 inches, here and there. I can do MUCH more than what I used to and what I do is much easier to do. For example, I painted a room in my house and I wasn't in agony for 2 days afterwards, like I would have been before.
It can be done! Just get her out walking slowly, at her own pace for 20-30 minutes per day. If that is too much, have her do it every other day. Eventually she will see that she is making progress and feeling better and that will encourage her to do a bit more.
<hugs> to you for being such an understanding and caring friend for her!

wow..thanks for bringing up the heart rate thing, i just know once mine hits 145 i get palpitations and feel horrible, water therapy/excercises are wonderful and just plain walking works great for me when able....start slow and increase slowly...takes time, but i see others who have fibro and have worked up to some good excercises, main key is to just stay moving...good luck!

I am 49 I gained ALOT of weight due to meds lack of exercise really any movement and comfort eating. I decided I was sick and tired of being sick and tired and joined MFP in july 2010 since then I have lost 108 lbs and feel like I have gotten my life back. I still have bad days but before i had a bad life , it was constant. i was falling asleep in mid-sentence, falling down constantly, I was in bed 3-4 days a week.
when I first started i just got in the pool with the kids everyday for about 20 mins just walking in the water and doing a little bit of swimming. when it got too cold to get in the pool I started walking at first it was only 1/2 way around the block and with a cane. I slowly very slowly did more and more as time went on. I had to be careful because if I overdid it my body would shut down. Tell her to hang in there and you are an amazing friend

Yoga has helped some of my friends with fibro, especially with stretching and improving achy-ness.

Personally, my biggest point in helping me be able to exercise again was therapy. After studying my body's habits & responses for almost a year, I've been able to pinpoint what physical & mental stressors cause my fibro to flare. By learning how to limit anxiety/stress/etc. and know what my physical limitations are at this point, it has opened up my world to exercise again.

But definitely, don't push it in the beginning. It can and WILL be frustrating to people who are former athletes or like working out. However, the body needs time to adjust and build the physical and mental strength back up to exercise. Patience is key.

Good luck to your friend!