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.
Exercise Heart Rates. A healthy heart rate during exercise is 60 to 85 percent of your maximum heart rate, which is 220 heartbeats per minute minus your age. If your heart rate is lower, you are not exercising intensely enough to improve your cardiovascular fitness.