i highly highly highly recommend bikram yoga ("hot" yoga performed in a room heated to ~105 deg/40% humidity). it will increase both your strength and flexibility (and under the guidance of a trained instructor vs. following off of website). there are also numerous benefits (copy and pasting from a studio site):
Works every organ, gland, nerve, tendon, ligament and muscle in the entire body
Expands your capacity to breathe fully and deeply
Prevents injury and improves symptoms of chronic illness
Promotes better sleep, regulating sleep/wake cycles
Rapid body toning
Weight loss or gain, depending on you body’s needs
Improvement in body posture and body awareness
Improves the healing and regenerative powers of your body
Improvement in T cell function and your immune system
Improvement in your lymphatic system
Lengthening and strengthening of muscles
Increased flexibility
Improvement in peripheral circulation
Improvement in metabolism and digestion
Gives the body a cardiovascular workout without impacting joints
Endocrine and exocrine glands are massaged and stimulated
Weight bearing exercise helps to prevent osteoporosis
Improves heart and lung functions
Improves back conditions, manages pain and misalignment
Improves the flexibility of your spine within its range of motion in all directions, allowing improvement in the function of your central nervous system. Better nervous system communication leads a better body and mind connection
Helps cultivate a sense of well being and a more peaceful mind
Integrates both sides of the brain to improve memory, learning, body coordination and balance
Builds mental strength and trains your mind to maintain a focused and meditative state
google it to learn more. not gonna lie--it's not your normal run-of-the-mill yoga class, it will most likely kick your *** the first few times. but if you stick with it, it will change your life
feel free to PM me if you have any questions!