Yes you will be. I have periods of off and on hard core cardio training that I do just fine in until I have to scale back. I compete in yearly obstacle courses like Warrior Dash (it's just like Tough Mudder but lighter) which is a 3 mile obstacle course over light to heavy terrain.
I am going to start working out again as my body needs it, slowly but in time I will pick back up to my normal pace. I did/ yoga, circuit training, jump rope, free weights and some biking and hiking. It's all about pacing yourself. Listening to your body. When you get TOO tired where you know it's not the normal workout fatigue then you need to scale back. I felt that feeling 3 months ago and stopped completely, shouldn'tve stopped everything.
I don't go into remission it's just that my body feels better when I do exercise but I tend to do too much like I used to so I have to learn how much is too much. Everyone responds differently. People told me that I could not work out vigorously as a fibro patient and I believed it until a few yrs ago when I started working out & decided to see how I would feel and never felt better. I can say that I am fit for my age & condition, I do yoga/Pilates with ease, I can bike ride (did so few a wks ago & all summer, it was great), I can still hike (did it all throughout the summer on the near by trials) and hit the gym. PACE YOURSELF!! It's your body, listen to it.
How far are you willing to push yourself? I know this flare up I am in has a lot to do with how hard I pushed myself in the gym the last 8 months so I now know that I can't push myself THAT hard : )
I'm going to start out with light circuit training, light jogging and light free weights (I also have a brace on my wrist so I have to tailor my hand exercises and push-ups to meet that) it will be hard and getting my body back to a point where I can do 10 burpees without stopping is not going to be easy but worth it. BUT I will be listening to my body this time!!!!!
Yoga is very good even for men!! Try it, it helps to loosen you up, take out the stiffness. I've been doing yoga since I was a teen, keeps me flexible. I have dvds of my favorite yoga instructors or you can join a place and do it with a group where they teach you the moves. Meditating is also good to get back to centered calm body. There is a dvd at MAYOCLINIC.com that has a fibromyalgia yoga dvd which is great for postures to do for us.
Dieting is a good way to help with exercises. I do fruit and fish diets quite often, it's brutal to just eat fruit and fish for a few months but my body feels great after it, cleansed.
Sorry so long.
Good luck to you.