Hi @cocotypo I'd recommend you look at the Wahoo Kickr trainer floormat they are also made by several other companies too, like saris. 

One more suggestion, get a front wheel block as well. This little piece of gear may look unessential, but it keeps your front wheel elevated and the bike level since the rear wheel is on or replaced by the trainer. If you don't use one, you will find yourself sliding forward or putting more pressure on your hands. It definitely makes for a more comfortable experience. 

Happy (stationary) riding! 

Jim

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