Plants: haploid generation of a plant produces gametes (sperm and eggs) and is called the gametophyte; the diploid generation produces spores and is called the sporophyte/ diploid zygote.
1 You gain the most benefits and lessen the risks when you exercise in your target heart rate zone. 2  Usually this is when your exercise heart rate (pulse) is 60 to 80 percent of your maximum heart rate. 3  In some cases, your health care provider may decrease your target heart rate zone to begin with 50 percent.
If you're a trained athlete, your normal resting heart rate may be closer to 40 beats per minute. A lower heart rate means your heart is able to function efficiently. This is usually a sign of cardiovascular fitness. Remember, resting heart rates are measured when you aren't actively moving.