If you're running with a group you could all have a number and take it in turns to choose the pace, distance and recovery of efforts. 2. Hills. Hills can be used to improve speed-endurance and strength-endurance, depending on the length of the hill.
Bing cherries are the most popular sweet cherry variety produced in the United States, according to Oregon State University. The skin of this sweet cherry is a deep burgundy -- almost black -- color. Other black, sweet cherry varieties include Sam, Schmidt, Ulster, Vista, Black Republican and Black Tartarian. The recommended serving size of fresh black cherries is 12, according to Harvard University. Sweet cherries are low in calories and provide fiber, vitamin C, minerals and melatonin to your diet.
1 The antioxidant activity of tart cherries was found superior to that of vitamin E and comparable to commercially available antioxidant products.  Sweet cherries contain fiber, vitamin C, carotenoids, and anthocyanins, each of which may help play a role in cancer prevention. According to the National Cherry Growers & Industries Foundation: The potential role of sweet cherries in cancer prevention lies mostly in the anthocyanin content, especially in cyanidin. Sweet cherries are a good source of cyanidins, which appear to act as an antioxidant and in this role may reduce cancer riskâ¦.