The practice featured 23 players, including star forward Rafael Burgos of Hungarian side Kecskeméti. Recently married Isidro Metapan forward Christian Bautista, 25, received permission to miss the session.
"I came at the request of the coach, I have no problems with my team," commented Burgos, who scored three goals at the 2011 Copa Centroamericana in Panama. "I came with everything arranged, so that there is no problem."
Santa Tecla goalkeeper Derby Carrillo has played the majority of his career in the United States and was delighted to be called into the squad.
"The current group is young, but it is the future," said the 25-year-old. "And the coach has chosen the players he wants and I have the great honor and privilege to be with them.
"It is our turn to play in the Copa Centroamericana and we have to do well, although we are young and have not played a lot together, we have to get everything and move forward."
The two-hour session, led by fitness coach Carlos Villareral, focused on physical conditioning.
The squad was expected to gather again on Thursday for workouts in the morning and afternoon.
"This week we will begin to do work on various fields around the country because we want to the team to be near the fans, so we have looked for training pitches in places like Nejapa, San Juan Opico, Hacienda Santa Clara, among others," said Ernesto Gochez, the national team coordinator.
El Salvador failed to advance to the final round of 2014 World Cup Qualifying in CONCACAF, finishing behind Mexico and Costa Rica in round three with one win from six Group B games. The Cuscatlecos, though, have qualified for the last three editions of the Gold Cup.