There are countless reviews of Caroline Girvan - here is one:
She started putting her workouts on YouTube at the start of the first lockdown, 2.5 years ago, and has since acquired over 2 million subscribers.
There a are now several EPIC series - 1, 2, 3, Heat, Iron, Endgame...... - plus countless shorter and targeted workouts. All completely free and without attempts to sell anything.
Caroline does her workouts in real time, in her own home, but they are extremely professional. Each workout starts with a detailed introduction in which she demonstrates and explains every move.
They are tough and challenging, and she uses serious weights, whilst all the time emphasizing that it is 'You Against You'. You sweat like a pig at times, and yet it is immensely rewarding and enjoyable.
And bloody hell, they are effective!! I could never have believed that I'd be capable of working out, with serious weights, for 90 minutes a day - and still feel energetic rather than exhausted at the end of it. I'm in my 60s and in excellent shape - rock hard thighs, tight core and muscles instead of bingo wings.
Can you tell I'm a bit of a fan...😂