Some students seem to throw themselves into practice and I am always concerned with such aggressive determination because it tends to burn out swiftly and if anything, this path of practice requires long-term commitment. Which is already something not held in very high esteem in our quite superficial, sensation-oriented culture. Others get interested, but never make a real commitment, remaining almost aloof or lackadaisical in their approach to practice. No roots are ever really planted and practice withers with a whimper.
That said, I always emphasize that it’s a disastrous mistake to take this teaching as some kind of fairy tale where once the middle way is found we can live happily ever after. Not too tight and not too loose is absolutely NOT a static position or orientation.
Not too tight and not too loose is ALWAYS in relation to circumstances and conditions. If you are well rested and feeling at ease, you can relax a bit in your meditation practice, but if you’ve had a rough night tending your sick child, and you are feeling tired, you will have to ‘tighten up’ a bit and use more energy (that you will feel you don’t have!) in order to practice.