[header] How to do a front aerial on the beam [title] Stretch well. [step] It's safer if you stretch for at least 10 to 15 minutes, before attempting difficult skills. [title] Practice on the floor, and along a line. 
[step] A couple of prerequisites, (things you need to be able to do first) are a front walkover on the beam/line. Also, you'll need to be comfortable doing a front aerial, on the floor and line first.