Last year I was doing regular aerobic exercise, 3 times a week, 10 minutes on the elliptical trainer. THis was increasingly causing me to be dog tired the next day, and often gave me heart palpitaions, achy muscles etc, the common PEM symptoms. Anyway, it got so bad that I decided," ok , I'll do no aerobic, not even walking and cut that out and do only light weights." So thats what I did for 7 months or so. Cut all aerobic out. Then after about 7 months I just felt like I needed to get my heart pumping a bit. Very hesitantly I did 5 mins elliptical with a good effect and no next-day crash. Slowly over the past 3 months I've up'ed this to 15 mins and felt good. No heart palps and no next day tiredness. Now, I should say that muscle extertion has not been helped. If I work a new muscle group, PEM hurts for a few days, all the flu-like symptoms as before, but I am greatly encouraged by the aerobic. I walked home 35 mins uphill the other week and felt alright. My doc though the muscle aches was due to ammonia. She gave me stuff to try, but I dont think its ammonia. Anyway... Now, I did take a few things that I believe helped me. I think I have narrowed it down to: * Sublingual B12 Adeno, Sublingual Hydroxo * Sublingual B2 * Soul water (saturated salt water). The Soul water I think has helped me with minerals. My nails were quite speckled white, but now are the best looking they've been in years. And I have had poor absorbion. I just put a couple of teaspoons of celtic sea salt water in a bigger glass of water a couple of times a day. Anyway, thought I'd share my experience. I'm taking it easy. I think light weights and stretching help too,a nd I want to do more of that.