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.
date - the particular day, month, or year (usually according to the Gregorian calendar) that an event occurred; he tried to memorizes all the dates for his history class. twelvemonth, year, yr - a period of time containing 365 (or 366) days; she is 4 years old; in the year 1920.