Why Do My Legs Feel Heavy When I Run?
To be honest you could be getting these symptoms for a number of reason and its difficult to answer without knowing more about your training history and more info about your symptoms.
- Did you do a lot of weights for your legs? If so which exercises?
- Do your legs feel like they have“cramp” and when do you get the sensation of heavy legs? All the time or when you are running?
What you must remember is that if you have been doing any form of weight training for your legs and you are not used to it, just a small amount can really affect your muscles, as they are just not used to the stress of weight training. If you did do weights for your legs, I am not surprised that they feel heavy and crampy - the fibres are broken (albeit microscopically) and this can give you the sensation of heaviness and cramp.
If you didn’t do any weights for your legs, then there is no real physiological reason why you should be feeling heavy and crampy.
There is a chance too that you nutrition may not be adequate. Dehydration is the main cause of cramp, so make sure you are well hydrated, throughout the day as well as during exercise.
It is also worth making sure that you have stretch out your leg muscles well, both before and after you exercise. This will ensure that your muscle fibres are in good alignment and are able to contract efficiently.