A. No. If you keep up your stretching and use full movements in your weight training, you should be fine. If you’re doing bodybuilding training then flexibility could become an issue. Then again it all depends on the individual and their natural makeup.
A. Nuts are great for you; full of good quality and beneficial fats. Know that fat doesn't make you fat, however eating foods that are not right for you, or eating a lot of one type of food, can.Your diet should have variety. I’d have just 1 handful of nuts (approximately 8-10 nuts) per day and rotate the types of nuts you are eating.
A. My suggestion is to stop running for now and see a physio or specialist to see if they can identify what is causing the pain. Running is very hard on joints, especially over long periods of time, so it could be a number of things: shoes, the way your feet are, how much weight you’re carrying etc.
A. There are a number of reasons this can occur; it’s hard to pinpoint exactly without knowing more about you. However, I would start with what you are eating for lunch. What you eat affects your body within minutes, so your lunch is going to impact on your energy for the afternoon.