First of all, is the training program provided by an eligible educational institution? If the answer is no, then none of the expenses will be 529 qualified education expenses, and income tax plus a 10% additional tax will be assessed on the earnings portion of any 529 distribution.
From IRS pub. 970:
Eligible postsecondary school. An eligible postsecondary school is generally any accredited public, nonprofit, or proprietary (privately owned profit-making) college, university, vocational school, or other postsecondary educational institution. Also, the institution must be eligible to participate in a student aid program administered by the U.S. Department of Education. Virtually all accredited postsecondary institutions meet this definition. The educational institution should be able to tell you if it’s an eligible educational institution.
If the training program is conducted by an eligible educational institution, the school will have published a "cost of attendance" that breaks down the cost of tuition, fess, and room and board (or living expenses). These cost of attendance figures will limit the amounts that can be claimed as qualified expenses. Rent and meals are only 529 qualified expenses to the extent that the student is considered to be enrolled at least half-time, "as determined under the standards of the school where the student is enrolled."