Get on the train.
Zwift's Kinetic Z Rollers Flexible Package sets up a train of power measurement, transmission, and display — the only thing missing is a subscription to the Zwift online training software and you, the engine. The ANT+ dongle receives power readings from the included Pioneer/Shimano Dura-Ace Power Meter Crankset, and those watts are then translated to the online environment of Watopia, propelling your on-screen avatar.
Of course, neither the power meter nor the rollers are limited to use with Zwift. The smart functionality of the Dura-Ace power meter speaks for itself, but we'll advocate on behalf of the Z Rollers, whose simplicity and double-folding design means they collapse down to one-third of the length for storage at the bottom of a closet, under the foot of the bed, or in the trunk for warming up before a race. The light aluminum drums and steel bearings are tough enough for abuse in any environment, and the quiet operation means you can Zwift into the night without risking the ire of neighbors.