Which action would contraindicate a person with a previous history of low back pain from performing certain exercises?

A contraindication refers to a specific situation or condition in which a particular exercise or physical activity should be avoided due to the potential for exacerbating an existing condition or causing injury.

In the context of a person with a previous history of low back pain, performing high-weight resistance training can pose significant risks. This type of training often places substantial stress on the spine and its surrounding structures, potentially aggravating past injuries or leading to new issues. High-weight exercises can increase intra-abdominal pressure and strain the lumbar region, which can be particularly problematic for those who have previously experienced low back pain.

In contrast, other options like spinal flexion exercises or core stability exercises can be managed with proper technique and supervision, and lower body exercises can often be modified to reduce strain while still being beneficial. Therefore, avoiding high-weight resistance training is prudent for someone with a history of low back pain, making this the appropriate answer.