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*have* you been kicked by a horse?In all honesty you are not giving much away here ... could be you have this virus going around, poss knackered from training, poss overdid it yesterday .. who knowsRest and reassess when you feel less like you have been kicked by a horse (or a cow)
How old are you Jonny? Do you stretch? I never used to, used to jump out of bed and play football 5 times a week. These days 10 minutes stretching either side of a run or match is required.
Are you eating properly? I tend to get achy when I'm eating nutritionally poor food, or not enough food
Well it depends what you consider a normal packed lunch and evening meal, and snacking isn't always bad if you need the calories and chose something with nutritional value such as a banana or nuts.
When I was training hard I found that snacks were important as otherwise I couldn't get enough calories in me from meal times.
Maybe as a one off it is worth adding up the calorie content of your food. Aim for 2500 plus about 500 cals for every hour of exercise and you probably won't be far off your daily requirement as a general rule of thumb. It will give you an idea of whether your intake is in the right sort of range.