1 This helps keep your upper back straight while having a slight arch in your lower back. 2  Slowly lift by straightening your hips and knees (not your back). Keep your back straight, and don't twist as you lift.  Hold the load as close to your body as possible, at the level of your belly button.
Definition of birthday. 1  1a : the day of a person's birthb : a day of origin. 2  2 : an anniversary of a birth her 21st birthday.
âº a day when we remember or celebrate something important that happened on that day in a previous year: To celebrate our wedding anniversary, we gave a big party. (Definition of âanniversaryâ from the Cambridge Academic Content Dictionary Â© Cambridge University Press)