Smart Trainers

: Unlike children where a precocious tendency might be a sign of intellect, there is no value in a sassy trainer.

Rollers

: This month 3 in 10 Slowtwitchers said their year-end spend will be on stationary training, equal to all other sport spending combined. Here is one class of stationary trainer.

Turbo Trainers

: The ubiquitous product for indoor cycling. Attaches to the rear of the bike, suspends it just above the ground, exerts some form of resistance while you pedal.