Are you the giving type? Do you think of others more than yourself? If you do, research has shown your giving ways will make you happier and add more meaning to your life. Depending on your giving strategy, your giving might make you more friends, increase your skills, and further your success at work.

However, the news is not all good for the generous among us. Being a giver can also burn you out, leaving you with a bitter taste in your mouth and resentment for those who don’t appreciate your efforts. So what’s a giver to do?

In organizational psychology expert Adam Grant’s book Give and Take, he shows four ways givers can stay motivated without spreading themselves too thin. The key for anyone to become a giver is to see the impact you’re making, find the most rewarding type of giving for you, time-manage your giving, and spend enough time giving to see the benefit.

1. See the impact you’re making.

One of the rewards of giving is seeing the impact you make. A sense of service to others is a great source of motivation. However, if you don’t see the change you make in the world, it’s hard for you to feel attached to the giving process and will make your giving feel less meaningful. Witnessing the impact on grateful recipients serves not only as a buffer against stress but also as an incentive to keep on giving.

So when giving, choose a type of giving where you can witness your impact. Cleaning the beach or planting trees might not fill your cup if you don’t see people or the environment enjoying the benefits, but fostering dogs or cats might do the trick when you engage with these happy animals.

2. Find an opportunity that is personally rewarding.

When you give out of a sense of duty or obligation, you won’t reap the benefits of giving. People who feel joy from giving only do so if the action is an enjoyable and meaningful choice. The key is to find opportunities for giving that are personally rewarding for you.

If you volunteer because someone tells you too, then you won’t get many rewards from it. People can give in many ways. If you enjoy reading, you can volunteer to teach people to read. If you like to get outdoors, you could clean hiking trails making them cleaner for you and everyone else. As long as you find the action personally rewarding, the act of giving will increase your motivation.

3. Chunk your giving.

You can get more out of your giving experience if you cluster your giving experiences into short windows of time. Grant said studies have shown people who sprinkled their giving reaped fewer benefits from their activities than those who chunked it. For example, people who volunteered a small amount of time over a number of days, rather than all their hours on one day, didn’t feel significantly happier. Researchers speculated all the logistics and disruption involved when volunteering for shorter times over several days dissipated the joy from volunteering.

So when giving, try to chunk your time. Send all your thank you notes out on one day; volunteer all your hours at one time; or choose what time of day you will help people at work and what hours you will focus on your own work.

4. Volunteer at least 100 hours.

Volunteering can be very rewarding. However, you need to find the sweet spot in the amount of time you volunteer to really gain the rewards. In studies done on volunteers, Grant said those who volunteered between 100-800 hours a year were happier than those who did less than 100 hours or more than 800 hours. All you need to do is volunteer 2 hours a week for a year to get this benefit. People who volunteered in something they enjoyed and felt a sense of purpose for also saw significant gains in energy.

So if you want to increase your happiness and success, think about giving more to others around you. Don’t give out of a sense of duty, obligation, or to get people to owe you. Instead, choose an activity where you can see the impact, one you find personally rewarding, and schedule it in a way that is convenient to your schedule.