I've also been asked to participate in a team Crossfit event at the end of this month - I would LOOOOVE to, but I really don't know how I'll be feeling in such a short period, nor if it's the best thing to do for now (I talk about my heart rate below), so I will have to think about it.
It was quite funny at work, as I saw some colleagues I hadn't seen in a while, and a few of the guys were like "woaaa, AJ, HOW do you have so much muscle? What do you eat??? What supplements do you take??? How do you train???", and were literally asking me all day details of what I do! I find this funny because I really don't feel in good shape at the moment, considering the current health situation, which has meant really inconsistent training the past few months, and not the best food choices (still always wholefood and very clean, but just aloooot and sometimes sporadic days with a lot of dried fruit, or coconut butter, or raw chocolate, or all 3 :P - usually because I started reacting to all foods anyway (autoimmunity), so thought, well if I feel bad after eating anything, then why not eat anything! Not the best mentality ;)). The first thing I said was "steroids" ;) But in the end all I could really say is, "eat A LOT, and train minimally but heavy!"
One thing is that I still feel my heartbeat rise extremely fast (hyperthyroid symptom). I notice it acutely in the gym, to the point where I have to stop and take a break - and there is often a slight delay, so I stop, then maybe 3-5 seconds later it gets to a climax, then it takes maybe 20-30 seconds before I go on.
It's not just a typical fast heart beat, it's a specific feeling, and the only times I've felt it is when I've had hyperthyroid. Even just riding the bike at a leisurely pace. And it's not typical for me at all - I used to be the one in Crossfit who could just smash AMRAPs (As Many Reps As Possible in a given time frame) as I didn't need to take any breaks and would just go, and go, and go; and when I was training for the Half Ironman, I had a relatively very low resting heart rate of 40 beats per minute! Now it's around 70. So this will be one thing I'll be keeping a close eye on to see if I see any changes, and from tomorrow I'm going to track my waking resting heart rate.