let's be honest, especially if you're a natty and not in your 20's, sometimes pack yr shit and head to the gym it's not easy.
I'm pretty consistent but we all have those days.
So what you do to get extra motivation?
I use music a lot, and lately also ignore the planned workout and do my favorite body part or exercises.
Give me some ideas just in case 
I know you asked this question in the setting of being a natural, but would you consider getting on HRT?
With HRT, you would feel much better every day. More strength, better stamina, drive and improved recovery during workouts, not to mention quicker gains.
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