Jarina specialized in the Hammer Throw first as an athlete, A master athlete, and then a Coach. He was the Philippines ‘ very first international hammer thrower.
One of his earlier triumphs at the 1978 Palaro Nationals was his win over the Giant Ereng in the Discus with a hurl of 40.24m. This feat gained him a spot on the national team.
Qualifying for the 1979 SEA Games he finished 5th in a then Filipino National Record in the Hammer of 40.32m in Jakarta.
At the 1981 SEA Games in Manila, he took bronze in both the Discus (42.23m) and Hammer Throw 46.40m.
He hurled his PB in the Discus at 43.62m in Baguio City 27 June 1982.
In 1983 he crowned himself SEA Games Champion in Singapore for the Hammer with a 48.80m National Record. Exhausted from his efforts a few days later he dropped down to 5th in Discus in 39.60m. This was the first and only SEA Games Gold of his career.
In 1985 he lost his SEA Games title by a few centimeters to Samreet Singh Dhaliwal of Malaysia 49.04m to 48.98m. He failed to place at the 1987 SEA Games.
No longer a spring chicken Jarina bettered his National Record with a 51.98m effort at the National Open in Manila in May 1995 with a throw of 51.98m. For this effort, he was selected to the World Championships in Athletics.
1995 World Champs in Gothenburg, Sweden finishing the last place in Hammer 49.98m. Jarina picked up the Bronze at the 1995 SEA Games with a 50.20m effort.
Jarina still occupies the #4 spot in the Philippines All-Time Lists in Hammer.
Coach Dan Jarina
As a coach, he mentored Arniel Ferrera who he guided to 4 SEA Games Championships and Arniel broke Jarina national and south-east Asian records. Gerro Perrater who had a SEA Games Bronze in Hammer in Manila. Loralie Amahit-Sermona who broke and still holds the Philippine Record for Women in Hammer and had a SEA Games Bronze medal. Jarina retired as a national coach after the 2015 SEA Games.