When riding, it is important for our horses to be soft and supple in order to perform to their potential.  Horses reflect back to us what we send to them through our body language.  We must ride with softness and suppleness in our bodies, if we wish to obtain the same from our horses.  It is good practice while riding, to do a quick body scan on ourselves to detect any points of tension and work on softening ourselves.  Your horse will thank you.