Those who would like to follow a class from a old-olympic MMA-er, have to go to Sportcentrum Kops. The owner of this gym is Bert Kops, wrestler with 30 titles. This is the place to go if you want to learn the secrets of martial arts.
Please bring your own boxing gloves! It's possible to use the gym to workout on your own. Please check their website for the opening hours.
And get access to 392 gyms and studios in Amsterdam with one sports membership.