I find a tiny bit of yoga everyday can build a lot of strength. I quite enjoy cycling when I'm able as you can cruise when you need to.

I bought a fitbit last year which surprisingly helped me keep on eye on my activity levels and encouraged me to do more. Having this as something you check everyday keep at the fore of your mind.

I go to the gym, at first i found it hard but now really enjoy going and feel so much better for it. Yes i have to go to bed afterwards, but i either go after work and have an early night or I'll go at the weekend and have an afternoon nap. I had a session with a personal trainer who understood fibromyalgia and set me a programme to help, i now do much much more x

Tia Chi is good and so is some Yoga. I've been working out on a weight machine. I don't get crazy and lift to much and i don't do it for hrs. I have noticed it seems to be helping my joints. Someone told me if you work the muscles it helps protect the joints more.

I will second, third, and fourth yoga. Even if you just start doing poses on the bed or wherever you can feel the most comfortable, it will help. And it isn't about doing headstands and bending like a pretzel, although that's certainly attainable with time and practice. There are some great videos on YouTube!

Whatever you decide to do, start with just a short time. Walk five minutes out and five back, and increase slowly by a minute or two until the total walk is about 30 minutes. Gentle swimming is great.
All stretching is good. Light weights (baked bean cans will do for a few lifts. A physio said best start no more than five minutes, else you'll be in pain and won't want to try again!