Enter Arena

.
Enter (http://www.thefreedictionary.com/enter).
• To come or go into
• To introduce; insert
• To become a participant, member, or part of; join
• To gain admission to
• To embark on; begin
• To make a beginning in; take up
• To write or put in
• To place formally on record; submit
• To penetrate; pierce
.
Arena (http://www.thefreedictionary.com/arena)
• An enclosed area for the presentation of events
• A building housing such an area
• A place or scene where forces contend or events unfold
• The center of an ancient Roman amphitheater where events were held.
.