Strengthens the quads but protects the knees. One of my all-time favourite knee strengthening exercises. Starting position: Stand with your back against the wall, feet apart, toes pointing forwards. Action: Slowly slide down the wall a few inches bending your knees.Hold for 3-5 seconds and return to starting position.trengthens the quads but protects the knees. One of my all-time favourite knee strengthening exercises. Starting position: Stand with your back against the wall, feet apart, toes pointing forwards. Action: Slowly slide down the wall a few inches bending your knees.
Meanwhile, officials in Frankfurt, Germany, say that hot dogs were invented in their city in 1487. And according to a third tale, a butcher named Johann Georghehner, who lived in Coburg, Germany, invented the hot dog during the late 1600s, and traveled to Frankfurt to promote his new food.
Quick Answer. Mustard gas was first invented in 1822 by CÃ©sar-MansuÃ¨te Despretz. However, it was not until 1860 that the compound was properly synthesized and studied through the experiments of British scientist Frederick Guthrie. His experiments yielded a proper characterization of the compound as well as notes regarding its irritating properties.