Welcome to the club
First off, welcome to the forums, and kudos to you for taking the initiative to get some cardio workout into your exercise regimen. My recommendation to you is to read up on the "What Bike to Buy" Forum in addition to threads here. There will be some very good recommendations in these forums. Unfortunately, your $400 is not going to buy much of a bike, let alone a bike that will handle your weight. You might want to consider buying something used and save a few bucks that way. The reality of it is that for heavier riders like us, you need stronger components that will stand up to the abuse our weight puts on the bike and it's parts. To find something that is made for off-road travel and will handle your weight, you're looking potentially in the $900+ range. There are bargains to be had if you look hard, but it will take time and a lot of research on your behalf.
I'm sure others will come along and add their comments, too.
Bob
First off, welcome to the forums, and kudos to you for taking the initiative to get some cardio workout into your exercise regimen. My recommendation to you is to read up on the "What Bike to Buy" Forum in addition to threads here. There will be some very good recommendations in these forums. Unfortunately, your $400 is not going to buy much of a bike, let alone a bike that will handle your weight. You might want to consider buying something used and save a few bucks that way. The reality of it is that for heavier riders like us, you need stronger components that will stand up to the abuse our weight puts on the bike and it's parts. To find something that is made for off-road travel and will handle your weight, you're looking potentially in the $900+ range. There are bargains to be had if you look hard, but it will take time and a lot of research on your behalf.
I'm sure others will come along and add their comments, too.
Bob