Absolutely! Your needs and the Olympic athlete's differ by degree not kind. Increased power, speed, strength, cardiovascular and respiratory endurance, flexibility, stamina, coordination, agility, balance, and accuracy are each important to the world’s best athletes and to our grandparents.
The amazing truth is that the very same methods that elicit optimal response in the Olympic or professional athlete will optimise the same response in the elderly. Of course, we cannot load your grandmother with the same squatting weight that we would assign an Olympic skier, but they both need to squat. In fact, squatting is essential to maintaining functional independence and improving fitness. Squatting is just one example of a movement that is universally valuable and essential yet rarely taught to any but the most advanced of athletes. This is a tragedy. Through painstakingly thorough coaching and incremental load assignment CrossFit has been able to teach everyone who can care for themselves to perform safely and with maximum efficacy the same movements typically utilised by professional coaches in elite and certainly exclusive environments - Courtesy of CrossFit Inc.