RANKED: The world's 20 strongest militaries. Despite budget cuts and a reduction in size, the US has maintained its position as the world's strongest military, according to a report on globalization from Credit Suisse. While the US is still far and away the world's top military superpower, Russia and China are its closest rivals. Canada, however, is the weakest of the twenty countries on the list. Credit Suisse acknowledged the difficulties of determining comparative military strength in its report.
Running Form Mistake #1: Heel Striking. Erik Isakson/Getty. Heel striking is when your feet are landing in front of your hips, so your heel is hitting the ground first. Ideally, you want to land mid-foot, or on the ball of foot.
The result is an unsightly bruise or black toenail. Warmer weather also increases your chances of developing a black toenail. Warm weather causes the blood vessels to dilate allowing more blood to sling forward in the toes during running. Symptoms. Generally speaking, black toenails are not painful. The tiny ruptured blood vessels only cause the unsightly appearance of the nail. However, if enough fluid builds up under the toenail the pressure can cause pain, swelling and throbbing.