[1] Ena enrolled at Brigham Young University in the spring of 1997 and immediately joined the BYU Cougars football team as a linebacker, redshirting the 1997 season.
[2] Moving from the strong side to inside to replace the NFL-bound Rob Morris, Ena had a breakthrough season in 2000, again starting all 12 games while leading the team with 107 tackles, in addition to three sacks, four pass deflections, one quarterback hurry, and three forced fumbles.
[4] Following the 2002 NFL draft, Ena signed as an undrafted free agent with the Philadelphia Eagles on April 26, 2002.
[5] Ena began a coaching career in 2008 as special teams coordinator at Southern Utah under Ed Lamb.
Ena then spent four years at Utah under Kyle Whittingham, starting as the linebackers coach in 2015 before adding co-special teams coordinator to his duties in 2016.
[13] On January 2, 2023, after one season at San Diego State, Ena joined Kalani Sitake's staff at Brigham Young University football as the defensive assistant coach over linebackers.