I'm a newbee to MTB. Have been riding for 3 months, and doing single track the last 3 weeks. I'm riding / exercising every 2nd day at least. Today something strange happened. When I started off I was feeling unbalanced on my mtb. I thought I just needed warm up and that it will get better. But it got worse, I was so unbalanced and felt out of control on the track, I fell 3 times. (ouch) Nothing changed in my eating habits or exercise routine. Is this something that happens a while after starting to exercise - something like a dip... I don't know. Or is this just something out-of-ordinary-once-off-feeling?