Major league baseball player contracts are often signed for multi year periods, with large annual salaries for exceptional players. Agents who work on behalf of players frequently negotiate the terms of major league baseball player contracts, arguing on behalf of their clients in order to get the best possible deal. Large signing bonuses are common in major league baseball player contracts. Signing bonuses are paid to players when they sign a contract, and are often used by teams in order to persuade a player to sign a contract. Major league baseball player contracts often frequently have clauses and addendum relating to a wide variety of perks for the player, negotiated by the player's agent. A contract may specify the specific type of lodging that a team must provide the player when traveling for away games. Special services may also be included in a contract, such as massages and the services of personal trainers.