Question: Shemuel Pagan is training at the gym of the boxer who fights in what weight class?

Context paragraphs:
Taekwondo weight classes: In taekwondo, a weight class is a standardized weight range for taekwondo practitioners.  The upper weight limit for each class is the lower limit of the next highest class.  A taekwondo gyeorugi is usually scheduled for a fixed weight class, and each practitioner's weight must not exceed the upper limit.

K-1 World MAX 2007 World Championship Final: K-1 WORLD MAX 2007 World Championship Final was a kickboxing event promoted by the K-1 organization.  It was the sixth annual K-1 World MAX final for middleweight kickboxers (70 kg/154 lb weight class), involving eight finalists and four reserve fighters, with all bouts fought under K-1 rules.  Seven of the finalists had won elimination fights at the K-1 World MAX 2007 World Tournament Final Elimination, while the eighth, Gago Drago, had been invited despite losing his elimination match.  Another defeated elimination fighter Virgil Kalakoda would be called up to take part in a reserve fight, while the other three reservists were invitees.  As well as tournament fights there was an opening fight and two super fights fought under K-1 rules (various weight classes).  In total there were eighteen fighters at the event, representing ten countries.

Weight class (boxing): A weight class is a measurement weight range for boxers.  The lower limit of a weight class is equal to the upper weight limit of the class below it.  The top class, with no upper limit, is called heavyweight in professional boxing and super heavyweight in amateur boxing.  A boxing match is usually scheduled for a fixed weight class, and each boxer's weight must not exceed the upper limit.  Although professional boxers may fight above their weight class, an amateur boxer's weight must not fall below the lower limit.  A nonstandard weight limit is called a catch weight.

Sadam Ali: Sadam Ali (born September 26, 1988) is a Yemeni American professional boxer, who fights at welterweight.

K-1 World MAX 2005 Championship Final: K-1 World MAX 2005 Championship Final was a kickboxing event promoted by the K-1 organization.  It was the fourth K-1 World MAX final for middleweight kickboxers (70 kg/152 lb weight class), involving eight finalists and two reserve fighters, with all bouts fought under K-1 rules.  All eight of the finalists had won elimination fights at the K-1 World MAX 2005 World Tournament Open, while the reserve fighters were invited despite suffering defeats.  As well as tournament matches there were also three super fights fought under K-1 rules (70 kg/152 lb weight class).  In total there were sixteen fighters at the event, representing nine countries.

Professional wrestling weight classes: In professional wrestling, a weight class is a standardized weight range for the wrestlers.  The top class in almost every promotion is heavyweight, but super heavyweights exist.  Weight class matches in modern-day American professional wrestling are rare, but weight class championships still exist.  However, Japanese professional wrestling, Mexican wrestling and British wrestling use the weight classes more seriously.

Shemuel Pagan: Shemuel Pagan is a professional boxer in the Lightweight division.  He is trained by his father, Robert Pagan.  He is currently training at Sadam Ali's gym in Bay Ridge, Brooklyn.  Shemuel Pagan is a Puerto Rican American of strict Jewish faith.

K-1 Grand Prix '99 Final Round: K-1 Grand Prix '99 Final Round was a martial arts event promoted by the K-1 organization.  It was the seventh K-1 World Grand Prix final involving eight of the world's best fighters, with all bouts fought under K-1 Rules.  The eight finalists had all qualified via elimination fights at the K-1 World Grand Prix '99 Opening Round.  Also on the card was a number of 'Freshman Fights' and an 'Opening Fight' fought under a mixture of Jiu-Jitsu and K-1 Rules (various weight class) and two 'Super Fights' fought under K-1 Rules (various weight classes).  In total there were twenty fighters at the event, representing eight countries.

Lineal championship: In combat sports where champions are decided by a challenge, the lineal championship of a weight class is a world championship title held initially by an undisputed champion and subsequently by a fighter who defeats the reigning champion in a match at that weight class.  In professional boxing, the lineal champion is informally called "the man who beat the man".  Champions recognized by sanctioning bodies such as the World Boxing Association (WBA) or World Boxing Council (WBC), or the Ultimate Fighting Championship (UFC) may vacate their title voluntarily, or be stripped of the title for breaching the sanctioning body's regulations or contracts.  There will thus be a breach of continuity in the list of sanctioned champions which the lineal championship is intended to prevent.  However, there is no single canonical list of lineal champions at any weight class, because there is no agreed upon method of determining the starting point for each lineage and conflicting opinions on what to do when the current champion retires or moves to a different weight class, although there is agreement that any stripping of a title be discounted.

List of current mixed martial arts champions: Mixed martial arts (MMA) is a form of competitive combat sport, akin to boxing, muay thai, or kick boxing.  MMA titles, or championship belts, are given to those fighters deemed by a promotional organization to have met a certain standard of athletic accomplishment in a specific weight class (most often by means of a championship fight).  Championship belts are fought for at each weight class under a promotion, with only one belt awarded per class.  Each belt is usually contested every time the belt holder fights, and passed to the victor of that fight (see the List of UFC champions for a chronology of UFC title belts).  A belt may be vacated when a fighter leaves a promotion, or is suspended.  At such times an interim champion may be crowned, or the belt may be awarded to the winner of a fight between top contenders.

Supporting paragraphs: Shemuel Pagan Sadam Ali
Answer: welterweight