Mashing and knee problems.
Hi. I hope you enjoy cycling as much as I do (I'm relatively new as well).
Recently we were visited by a person who arrived on his bike and during conversation about how he was, he mentioned he had to have a knee operation, but was recovering with less leg extension than he had previously. When we began discussing how he was going with cycling, he mentioned that he always uses almost the hardest gear there is and rarely changes gears. (Which equates to mashing in my mind.) It turns out he thought it would strengthen his knees and legs to do this. From my very minimal knowledge I thought this method of riding would place excess strain and wear on knees (possibly our friend created his knee problem from his riding style).
If you have gears I would suggest finding the one that is comfortable and easy to start pedalling on, and then gradually progress through your gears if necessary. I find that if I can predict a stop (e.g. at an intersection etc.) I will change down in anticipation of needing an easier start off. It is becoming like second nature now.
Happy riding.:)