Are you for real?
I wouldnt have thought you would have carried that but perhaps blown away at that weight/height ratio.
Answer quick and simple without seeing pics of you and also without knowing current bf levels (although i can tell you are classic ectomorph):
You need weight resistance training; join a decent gym.
Depends on what you're after - something sustaineable or whether you want to waddle around with excess bulk. don't knock it until you've tried it. I've found everyword of the following true.
Pilates - its benefits
What is Pilates? An innovative system of mind-body exercise evolved from the principles of Joseph Pilates.
Pilates dramatically transforms the way your body looks, feels and performs. It builds strength without excess bulk, creating a sleek, toned body and a flat abdomen.
It teaches body awareness, good posture and easy, graceful movement. Pilates improves flexibility, agility and economy of motion. It can even help alleviate back pain.
Professional dancers have known the benefits of Pilates for decades. Top athletes use it for strength, flexibility, and injury prevention.
Developed from the rehabilitation techniques of Joseph Pilates, Pilates is a safe, sensible exercise system using a floor mat or equipment, that will help you look and feel your very best. No matter what your age or condition.
The Benefits of Pilates
Build strength without "bulking up" - gain long, lean muscles and flexibility
Conventional workouts tend to build short, bulky muscles - the type most prone to injury. Pilates elongates and strengthens, improving muscle elasticity and joint mobility. A body with balanced strength and flexibility is less likely to be injured.
Develop a strong core - flat abdominals and a strong back
Building on the principles of Joseph Pilates, Pilates exercises develop a strong "core," or center of the body. The core consists of the deep abdominal muscles along with the muscles closest to the spine. Control of the core is achieved by integrating the trunk, pelvis and shoulder girdle.
Create an evenly conditioned body and prevent sports injuries
In conventional workouts, weak muscles tend to get weaker and strong muscles tend to get stronger. The result is muscular imbalance - a primary cause of injury and chronic back pain. Pilates conditions the whole body, even the ankles and feet. No muscle group is over trained or under trained. Your entire musculature is evenly balanced and conditioned, helping you enjoy daily activities and sports with greater ease and less chance of injury.
Learn efficient patterns of motion
Pilates exercises train several muscle groups at once in smooth, continuous movements. By developing proper technique, you can actually re-train your body to move in safer, more efficient patterns of motion - invaluable for injury recovery, sports performance, good posture and optimal health.
Be confident and safe
No other exercise system is so gentle to your body while giving it a challenging workout. Many of the exercises are performed in reclining or sitting positions, and most are low impact and partially weight bearing. Pilates is so safe, it is used in physical therapy facilities to rehabilitate injuries.
And be challenged
Pilates is also an extremely flexible exercise system. Modifications to the exercises allow for a range of difficulty ranging from beginning to advanced. Get the workout that best suits you now, and increase the intensity as your body conditioning improves.