What to look for in a bicycle meant for the exercise?
I am an underweight female so loosing weight is NOT my goal. I wish to get mentally fit and therefore I wish to tire myself out without getting bored. They say physical exercise is necessary to get rid of depression. Hence I chose to cycle out.


First and most important is the depression. You should really go to a bike shop and hop on a few different bikes and styles. Try them all. The one that makes you feel giddy and excited is the one to get. Pleasure, smiling, laughter, and exercise all release endorphins which help depression. Get the one that will not only give you exercise but also make you feel great! This is also how you will know if it is comfortable and fits you.


  wish to get mentally fit and therefore I wish to tire myself out without getting bored


This is best done by picking difficult challenges that you enjoy. It could be getting a BMX bike and working to learn one trick after another. It could be setting a speed goal for yourself that really forces you to push yourself. It could be any number of things. Just set challenging goals and surround yourself with others that will push you to reach them.


  I am an underweight female so loosing weight is NOT my goal.


Eat more. Seriously. Any exercise will cause a little weight loss and if you're really looking to challenge yourself mentally then that means more than a leisure ride. That means more calories. You'll have to learn what the right amount to eat is to not lose weight and then you can decide if you want to eat more to put on weight.



My feeling

The bike you chose looks odd to me but if it makes you happy it also looks versatile and fun. I could see taking to some trails and little jumps on it. Otherwise the more I write the more I'm inclined to suggest a smaller BMX bike like:



You can generally find them pretty cheap (not this model but other ones). They're incredibly durable. Relaxing for when you do want those roaming around trips, but can also be pushed for the fitness side. And learning a new trick or jump will burn less calories so you don't lose weight. Loads of fun too!