Hi garance, Cathe offers a wide variety of workouts on Cathe Live, including high-impact and low-impact classes. Though the cardio in this workout was mainly high-impact, it was only a small part of the class and can easily be modified as you will see many of the people in the class doing. Cathe does high-impact moves not because they're bad for you but because they're necessary for strengthening bones and developing power. Loss of bone mass as you age is a huge problem for many people and you need a certain amount of stress on a bone to make it grow - low impact exercise doesn't do this. Lack of the ability to generate power is also another problem as we age and again high-impact exercise helps this too.
Unfortunately, high-impact exercise has a bad reputation for many people when it really shouldn't. It's a myth that high-impact exercise is bad for your joints and research and studies back this up ( The Effect of High Impact Exercise on Knee Health
). It's common for people to blame high-impact exercise for every knee ache an pain, but quite often the real cause is body inflammation caused by eating too many processed foods and excessive body weight.
Obviously, there are many people that have damaged joints and can't do high-impact activities and for those people on Cathe Live we offer weight training workouts, low-impact workouts and cycle workouts that are zero impact. But you should do some high-impact exercise if you can - it's good for your health and good for your bones!