How many vertebrae make up the lumbar spine in an adult human?

The lumbar spine in an adult human is made up of five vertebrae. These vertebrae are typically labeled L1 through L5 and are located between the thoracic spine and the sacrum. The lumbar region is crucial for supporting the weight of the upper body and allowing for a range of motion, including bending and twisting movements.

Each lumbar vertebra is larger than those in the thoracic and cervical regions because they need to support more weight and handle more stress. This region is also a common site for back pain due to its significant mechanical load and the demands placed on it during various activities. Understanding the anatomy and function of the lumbar spine is essential for fitness professionals, particularly when designing safe and effective exercise programs for clients.