Pitching from the wind-up

[Coach C]

The pitcher is in the wind-up position. He starts his motion toward the plate with a step forward with his left foot going forward just in front of the rubber. The second move he does is place his right foot in front of the rbber in the normal position. He then lifts his stride leg in the normal manner. My question is: is it legal to step forward twice, once with his non pivot foot and then with his pivot foot. Most pitcher's step either sideways along the rubber or back with their non pivot foot before placing te pivot foot down in front of the rubber. I am seeing this more and more due to pitching coaches wanting the least amount of movement from their pitchers.