Before warming up the adductors, move your legs in semi-circles, always moving from the inside to the outside, first to the right, then to the left. Do around 20 repetitions on each side. You can also jog the length of the pitch while doing vertical jumps every 5 seconds, for example.
And finally, end the warm-up with ball exercises. You could do some ball handling exercises, ground passes and cross passes, etc.You're now ready for your training or match!
I emphasise the importance of warm-ups because I know that we sometimes have a tendency to neglect them, particularly when young, but learning how to protect our body is important for all footballers. We play a contact sport with a lot of risks of injury, so it's best to avoid adding to these by neglecting your body. Sometimes all it takes is one sprint without a warm-up, or a kick that's too extended, to injure yourself, and often when it's a muscle injury it can take you out of the game for weeks.