Tempo

Tempo was founded in San Francisco in 2015 by Moawia Eldeeb and Josh Augustin, two Columbia computer scientists; Eldeeb taught himself to train at a free gym while his family lived in a shelter.

The studio unit works with 3D sensors that emit infrared pulses 30 times a second and build a model of the body from them. It counts reps, corrects form and suggests weights – training uses real dumbbells, the classes run on a subscription.