During my Stockholm visit, I went training at X-Force in Vasastan. As I had been once before last year, I kind of knew what was waiting me, but I still got surprised when I ended up with muscle ache for almost 4 days afterwards. Especially my abs where in bits lol.
The difference from the gyms we are used to is that their machines are built to increase the negative strain on the return movement. Sounds odd, yes, but it actually make sense. Basically the difference when training at X-Force is that you feel the weight resistance mainly when you go back as 40% more weights are added on, and you need to make the return movement very slow. Activating our negative muscle power for 5 seconds during this return movement gives such a big difference in result that you need only a one day work out/week to achieve the same results as from a traditional gym work out. Good eh?!! I absolutely loved it and just wish they will open a franchise here in Marbella soon:-)