This individual is either former military or LEO and still is a "weekend warrior" or maybe is active LEO but sits in a cruiser most of the day or has an administrative job. The Impala may also be a responsible armed citizen who runs 3-gun competitions on weekends or has young kids at home for which they need to be their Sentinel and protector.
The Impala has experience working out and maybe was fairly fit at one point in the past, but has lost traction over the years and has been consuming stale low-octane fuel (i.e. junk food and or fast food).
This individual still has a need to maintain a basic level of fitness for their work and/or hobbies. The focus is on longevity through injury prevention, improving conditioning, and increasing strength in a safe manner.