I'm a large guy and needs to lose weight. My current bike is a Raliegh M-50 that I bought years ago. I am disabled and have heart disease and unsure how far I can ride any more. I do plan on going and starting out slow. I was advised to excercise and I chose cylcing.Wanting to know if my bike will hold me at 334,and what kind of saddle do you you all use? I'd like to go wider for more comfort. Also,should I invest in a heart monitor or anything. Thanks.