if you want to feel the changes... you have to work to your maximum potential.... what is your maximum potential.... the point where you find the most struggles in keeping going.... but then pushing even more.... meaning fatigue your muscles till their tired... and while they are... take a little break.... and force yourself to go EVEN HARDER.... this gives the max results...... even though its hard... your must remember,.... pain is just a neuron signal being sent to your muscles to stop.... resist this... as your will wants something more than what your brain "reccomends"