Another word for tandem

They moved in tandem without looking at each other, their movements controlled and efficient.

Next to a leisurely walk I enjoy a "spin" on my tandem bicycle.

My teacher and other friends think I could ride a Columbia tandem in the country with perfect safety.

Steam at high pressure exhausting into the atmosphere is still commonly used, but the great power required for raising heavy loads from deep pits at high speeds has brought the question of fuel economy into prominence, and more economical types of the two-cylinder tandem compound class with high initial steam pressure, superheating and condensing, have come in to some extent where the amount of work to be done is sufficient to justify their high initial cost.

I was eventually turned on to the line by a friend who insisted that I must purchase the Legally Blonde palettes, which were coordinated to release in tandem with the movie of the same name.