Jump ropes
Jumping ropes are of course the old-school training tool to start the warm-up. Jump ropes are used in boxing, cardio boxing, kickboxing, Thai boxing and MMA to get warm and improve your fitness. Of course you can also start a workout anywhere and everywhere with a good skipping rope.
Fight2Win is the martial arts paradise and has several types of jump ropes and speed ropes, both adjustable and of a fixed length. Hayabusa's super-fast speed ropes have a good ball bearing on the handle that can keep up with the rotational speed of the jump rope.