Some even include a subwoofer and may come with wireless rear speakers for a true surround sound experience with fewer pieces of equipment than you'd find in a component system. (polkaudio.com)
Use as few pieces of equipment as possible by choosing exercises that allow you to do so or slightly adjusting them so that you can use the same piece of equipment for more exercises. (fitnessandpower.com)
Wasted movement means wasted time and few pieces of equipment reinforce efficient movement like the kettlebell. (onnit.com)