How to move contents from cell D1 to cell A2.

I have over 6500 rows of data. In Columns A through C for each line I have data for boys name, and then similar data for the girls' name on the same line in columns D through F. I have inserted a blank line after each of the more than 6500 lines because I need to move the data in columns D through F down to the next line and over to columns A through C. Can anybody help me put together a macror for this problem?

Thank you!

Davitzin