Originally Posted by
Catherine99
I'm 38, have become quite out of shape & sedentary over the last 3-4 years though I used to be quite fit. I have just recently started riding a heavy beach cruiser casually for errands and as of yesterday I'm now also riding just to put on miles.
All the answers are going to boil down to "ride more".
That said, have you read up on what proper bike fit is supposed to be? That'll make a big difference, and it will (probably) help keep you from developing any repetitive motion injuries early on. Only reason I bring that up is because most people I see riding cruisers seem to have tiny or overly large frames, with their seat posts way too low.