This year I have been trying hard to get a lot fitter. I got a dog at Christmas and a Fitbit and have been walking about 15,000 steps per day. More recently I've tried to step the activity up a bit and last night I went to a very fit friend's house and she did a boxing session with me. We did it almost like a circuit, moving from exercise to exercise. She pushed me pretty hard and at points I felt like I was going to be sick but I got through it and enjoyed pushing myself.
This was the most intensive exercise I have done for quite some time and afterwards my hand were very shaky. I read up on it and understand it could be caused by dehydration so I've drank lots but am still shaking quite a lot now. Do I need to be worried?
If it makes any difference, I am a size 16 and 13.5st with an obese BMI so am obviously not in great physical shape. My resting HR is 60 according to my Fitbit.