Our expert says:
It depends, some people would find this too hard, others not. It seems from your question that you are coping fine with it, and so that leads me to suggest that you just continue, and don't worry too much about overdoing it, yet. Having said that, there is definitely a point at which exercise can become excessive, and you have to be on the alert for these signs.
The big one is failure to perform. You may find that your daily 1km swim takes a couple minutes longer, but you feel that you are working just as hard, if not harder. If that happens for maybe 2 or 3 days in a row, then it's a sign that you need a break and should rest, even if it's just for a couple of days. Some of the others are lack of sleep, irritability, loss of enjoyment etc. Any of these should set off alarm bells, if they persist for a long time. However, until such time, keep it up and enjoy training.
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