The Trainer is the new feature in Head Ball 2 to enhance your gameplay, strengthen your characters, and give benefits. You can see the Trainer button on the main screen to select your Trainer. You need to be at least level 20 to see the Trainer. 
There are four different Trainers for now, but there will be many more. Each Trainer has an additional feature that will increase your power or boost your match earnings.
There's a Common Trainer that you can select anytime, and he has unlimited time. In addition, you can choose other Trainers in exchange for Emeralds or purchase them on the Trainer tab.
There are also Rare, Legendary, and Heroic Trainers that can give you powerful boosts and more.
You can purchase the Trainer you like on the Trainers screen. Sometimes you may find offers that include Trainers as well. For example, you can receive; EXP Boost, Power Boost, Point Boost, Skill Boost, Fan Boost, or Gold Boost from the trainers.
As long as your chosen Epic Trainer is active, its rewards will accumulate even when you're not in the game. In the Trainer tab, you can see what benefits and prizes you can get by viewing your chosen Trainer.
Unlike the Common Trainer, the rest of the Trainers will leave after spending a specific amount of time with you.
If you obtain more than one Trainer, the duration of those Trainers will accumulate.
Once you collect this Trainer's rewards, the rewards begin to accumulate again. In addition, Players receive different prizes from the Trainer depending on their level.
Q: Does every Trainer give the same rewards?
A: No, each Trainer's rewards are different.
Q: Does the Trainer give the same rewards at all levels?
A: No, the rewards you get from the Trainer will vary depending on your level range.
Example:*Rewards for a level 50 player: (3,000 Gold, 20 Diamonds, 10 Coins)
*Rewards for a level 20 player: (1,000 Gold, 10 Diamonds, 5 Coins)
Q: Can I collect the accumulated rewards without using the purchased Epic Trainer?
A: No, the Epic Trainer must have been previously selected for rewards to stack up.
Q: Does the Trainer give the same rewards at all levels?
A: No, the rewards you get from the Trainer will vary depending on your level range.
Q: What happens to my rewards when the Trainer expires?
A: When your Trainer expires, you will need to re-purchase the Trainer to collect the rewards for that Trainer.
Q: Can I simultaneously choose the Common Trainer and the Heroic Trainer and benefit from both?
A: No, you can only select one Trainer at a time, and you can only enjoy the benefits of your chosen Trainer.