This activity could be an outdoor activity such as playing football and rowing or it could be act of socializing such as going to movies and attending a concert. The person who is accompanying you in these activities is your activity partner.
Knowing the definition of activity partner, you should also know what qualities should a good activity partner have. Finding the activity partners is easy but finding a good activity partner is more challenging. There are certain qualities that a good activity partner should have and knowing those can help you finding such a partner.
The most important quality that an activity partner should have is that he or she should make the activity fun and enjoyable. There is no point in having a partner doesn't make doing the activity fun. A good activity partner knows how to excite friends and make any activity fun. If you are doing some outdoor activity with a partner and if the partner knows you well and has some experience in that activity such as soccer or tennis then he or she would know how to make that activity fun for you as well.
A lot of the times we find a partner for some activity to get good at that activity. We look for someone who has prior experience in that activity. Our goal is to get ourselves better in that activity and the only way to do so is to learn from somebody who already knows it well. Therefore it is important that an activity partner who you are trying to learn from should be able to teach you something new or show you something about that activity.
Sometimes the reason to have a activity partner is to keep yourself encouraged and not lose the motivation. A good activity partner will also also push you to continue on your goal and give you the much needed encouragement when you feel you can no longer continue. With a partner you have to think twice before quitting your game because you have to answer to someone as well. This makes is it less likely that you will give up half the way in the activity and a great partner can always keep you going.