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.
Thankfully for you, vodka is a stable distilled spirit that keeps for a long time. So, how long does vodka last? Does vodka expire? If the bottle has not been opened, it will last indefinitely. Vodka will taste almost exactly the same if opened the day after purchase, or 40 years later. The storage of the spirit will change the taste very slowly over time, as some liquid may evaporate through a corked lid or chemicals will leach out of the plastics of a bottle.