in step
in step {adv.} or {adj. phr.}
1. With the left or right foot stepping at the same time as another's or to the beat of music; in matching strides with another person or persons.
The long line of soldiers marched all in step: Left, right! Left, right!
Johnny marched behind the band in step to the music.
2. In agreement; abreast. — Often followed by "with".
Mary wanted to stay in step with her friends and have a doll too.
Contrast: OUT OF STEP.
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Source: A Dictionary of American Idioms