Help your knees! I found this ages ago when my knee acted up from squats or even just too much bending in yoga. This is a list with videos and images of GREAT, easy exercises you can do to strengthen the muscles that support you knee, gently
If you feel self-conscious about having really skinny legs, you need to do some training to bulk them up. This infographic features 19 exercises you can do to take your legs up a few sizes. A Skinny Person's Guide to Gaining Weight
Anime Boy - It seems really different from the usual stuff you see. The graffiti, and his shirt, and just the street style is really neat. Interesting how his shirt says God bless you. And blood prayers.
Weak glutes contribute to a lot of chronic hip pain: piriformis syndrome, sciatica, lower back pain and other SI joint pain. You should always work to activate those dormant glute muscles to stabilize your pelvic and avoid compensation of the muscles.