Howcast - Learn tanto tori -- how to defend an attack with a tanto, or knife -- from the instructors at The New York Aikikai in this Howcast aikido video.

Howcast - Learn four deep tissue massage compressive techniques from celebrity massage therapist Meagan Holub in this Howcast video.

Howcast - Learn how to do a backward and forward lunge with a bosu ball from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to do a side twist with a bosu ball from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to do a bosu ball knee-repeater exercise from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to do a bosu ball power knee exercise from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to do a Charleston kick with a bosu ball from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to do a side lunge with a bosu ball from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to do knee-strengthening exercises with a bosu ball from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to do a step up with a bosu ball from personal trainer Rachel Shasha in this exercise ball workout video from Howcast.

Howcast - Learn how to improve your running form from competitive runners Doug Oldiges and Stephanie Coburn in this Howcast video.

Howcast - Learn how to do the top two plyometric exercises for men in this Howcast workout video about plyometrics.

Howcast - Learn how to do a plank tap in this Howcast workout video about plyometric exercises.

Howcast - Learn how to do a mountain climber in this Howcast workout video about plyometric exercises.

Howcast - Learn what a leg lock is in this Howcast video about lower body submission techniques for jiu jitsu, judo, sambo, and mma.

Howcast - Learn how to do a scissor takedown to ankle lock leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, and mma.

Howcast - Learn how to do rolling knee bar from whizzer grip leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo and mma.

Howcast - Learn how to switch from a knee bar to calf crush leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, and mma.

Howcast - Learn how to do a rolling calf crush from turtle leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, and mma.

Howcast - Learn how to do a calf crush leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, sambo, and mma.

Howcast - Learn how to do an ankle lock from side control leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, and mma.

Howcast - Learn how to do a knee bar leg lock in this Howcast video about lower body submission techniques for jiu jitsu, judo, sambo, and mma.

Howcast - Learn how to do the top three plyometric ab exercises using a slider in this Howcast workout video about plyometric exercises.

Howcast - Learn how to do a backward lunge jump in this Howcast workout video about plyometric exercises.