The hamstrings are in a connected line of pull from the pelvis via the sacrotuberous ligament structure to the sacrum, up the back extensor muscles all the way over the skull to the eyebrows. Also in the opposite direction, the hamstrings are part of a line of pull that connects down to the plantar surface of the feet. The hamstrings and muscles of the back body create a line of pull that keeps us upright and the tension in the back keeps the shock absorbing curves strung.
If you store them in air-tight bottles that are not opened day-in day-out, you can expect your e-juice to last anywhere from 12 to 24 months. However, there are other factors in play like the purity of the nicotine used, the quality of the flavoring and the manufacturing process.
Aerosol air fresheners can last for about 2 years. After that, they begin to break down and lose the lovely fragrance that inspired you to purchase them. Bleach can last between 3 to 6 months. After 6 months it can start breaking down to salt and water. Check the expiration date on the bottle before you use it. Ideally, you want to store bleach somewhere that stays between 50 degrees and 70 degrees Fahrenheit.