What this qualifies you for
You finish with the Level 2 and 3 Diploma in Personal Training, awarded by FOCUS Awards, an Ofqual-regulated awarding organisation, and CIMSPA certificated. That lets you work as a personal trainer in the UK: your own clients, in a gym, freelance, or in your own business, with the insurance and CIMSPA membership eligibility the work requires.
The difference is everything stacked around it. The core courses build the science, movement and client skills the certificate alone does not teach, and the optional courses qualify you in the directions your actual career takes, chosen with John rather than guessed at on day one.
This is the route for people who already know this is their career. Not a bag of courses. A degree model, without the degree price or the degree's three lost years of earning.