So I have had a couple of friends recently want to start putting on muscle and they have been coming to me for advice on how to do this. These are all very active people who did a lot of exercise and kept really fit. Generally, they have followed my advice and the programs I have written for them, but I seem to hit the same sticking point with them. They don't want to take a rest day. They keep wanting to train every day, because the harder and more you work in the gym, the bigger you will get, right? It feels good to make progress and I want to keep going!
Let me just say it, rest days are absolutely vital. There are no two ways about it. Whether you are doing weights training to build muscle, cycling long distances or any kind of regular training, you need to let your body rest.
When you do serious exercise, particularly heavy weights, you are tearing muscle fibres. These are small tears and it is these tears that promote muscle to grow back larger and stronger. It's only if you give them time to repair that this will happen, though! One if the symptoms of overtraining is a plateau in your results. This is because you don't give your muscles the time they need recover and repair. If they don't have this time, they won't repair properly and won't increase in size. So, if you are trying to increase in mass, you need to give your muscles time to recover from all that hard work you are putting them through.
The other reason rest days are a must is to prevent injury. If you don't believe me, check out my shiny new surgery scars on my shoulder. These came about from overtraining and not taking rest days. One small injury a I got while ago got incrementally worse over time, as I was in the gym or rowing 7 days a week. If you don't give your body the chance to heal when it needs to, small injuries may get worse over time, without you even realising. It's better to take that day one to make sure your are good, than having 5 months off for a shoulder reco and losing all your gains!
Now a rest day doesn't need to be a zero exercise day. If your main exercise is lifting weights, then go for a jog or a swim that day if you can't sit still. If you're a cyclist, get off the your bike and just play a game of football. Just make sure you ease back on it for at least one day a week.