Pebble is such an amazing.
It is a kind of smart watch , and this page for some applications built by me.
Pebble Abs Plank
An app helps you to make plank exercices to build your abs.
The plank is one of the best exercises to strengthen your core, which is more than just your abdominals. The core is a complex series of muscles that includes your entire body, minus your legs, head and arms.
Coming soon for more ...