Ve videu je napsane "You will need: A resistance band", coz jsou podle meho chapani prave ty gumy. Jeden konec drzi v ruce, druhej ma k necemu privazanej.
Nejak nevim, co v tom hledas za zahadu.
http://www.amazon.com/SPRI-Resistance-Exercise-Att achment-Individually/dp/B0085FOIOQ