How can it be that one day……………..

How can it be that my Saturday’s yoga practice took all that I had to complete and Sunday felt like I could go another 2 hours? I have similar experiences in the weight room as well. There are days that I can barely get through my workout and other days that there is not enough weight in the gym . I am constantly challenging myself and on days that I struggle I tell myself, give it 10 minutes. I know that if I can get through the early part I can complete my session. The key for me is to not give it up and enjoy the reward of a successful workout. So my question today is, do you face these same challenges and how do you overcome them?