Exercise during 2ww

Can anyone advise, I am in my 2ww and want to know if it's safe to exercise? 
​Mainly the gym and running. 
​I am on my 4 year and 2 month run and now on Clomid. Hoping this is our month but not sure if I should continue exercising or could that risk implantation etc? 
​Struggling as if clomid doesn't work we are going doing the <a href="https://glowing.com/glow-fertility-program">iui</a> route and I need to reduce my bmi for that so need to exercise but don't want to risk anything now. 
​Please help as I don't know what to do for the best