To relax : make or become less tense or anxious; rest from work or engage in a recreational activity ( Oxford English Dictionary) 

I have tried lots of relaxing activities, pilates, yoga, mindfulness colouring, meditation etc.. and I am truly rubbish at them, I fidget, let my mind wander, fall asleep, feel uncomfortable and awkward etc..  I have come to the conclusion that I am unable to relax by doing nothing.  

My prescription for relaxation is to get lost in an activity, something that is creative and fun, this could be a run, a sewing project, writing, music etc.. It needs to be something that takes my full attention and interest and leaves me no opportunity to think of other things.  Relaxation can also be as simple as a bath with bubbles, burning some aromatherapy oils or a good book.