The act of walking may not seem like a feat of agility.

The act of walking may not seem like a feat of agility, strength and brainpower. But lose a leg as Zac Vawter did after a motorcycle accident, and you will appreciate the calculations that go into putting one foot in front of the other.

Source: by Melissa Healy, 2013, Los Angeles Times.

In this paragraph, could I use action?

And could I use like instead of as?

www.onelook

www.dictionary.com

If you do something like somebody else did it you do it in a similar way.