Disclaimer

 As a footballer it is important to balance your training. As you get older, as a footballer, you tend to prioritize strength training over all else. But you must also train your touch, stamina and dribbling to be able to play at a high level. It is a common misconception that a defender does not need to know how to dribble or an attacker does not need to know how to defend. Every player must have some knowledge on every aspect of the game. They should be able to understand each other's struggles and be able to understand each other. So while you should be training your body to be in top form, you should also make sure to train your brain. 

As a goalkeeper, you need to close the angle of the attackers shot by moving forward and extend your arms and legs to make yourself bigger. This lessens the chance of them shooting past you. The way you come out, and the speed at which you do it are up to you. 

As a goalkeeper you need to be able to judge whether or not to come out of your goal.  

Stamina is very important in football, the ability to keep running at the same speed the whole game, can put you above everyone else. It allows you to create more chances, more options for your teammates, and stop attacks throughout the game.

If you train two times a week, and have a match on the weekends, then you might not need to do any fitness training, however as the level increases, you might have to start doing cardio sessions. This can include going running, cycling or swimming. I advise doing something that you enjoy, as cardio can be tiring and if you don't enjoy it than you are less likely to stay consistent and increase your stamina. 

It is important that you don't overdo it with the cardio. I advise not running after an intense training session or match, for this can result in injury. But still try to include at least 1 hour of cardio or sport inn your daily routine.