Virtually fit: spider plank, legs, rhythm and core

This week various fitness web clips have been ranked as "most popular" on, an internet fitness channel that was rated by the US publication Time as one of the 50 best websites of 2010.

Here are this week's top four video clips to tone your legs, find the beat and inner strength all while just spending a few minutes with a mat and your computer streaming these clips:  

Celebrity fitness trainer from the television series The Biggest Loser Jillian Michaels demonstrates the Spider Plank:

Trainer Holly Perkins highlights three moves for thighs, hamstrings and glutes in her custom Leg Makeover

Tae Bo master's son Billy Blanks Jr. helps you to keep the beat with Rhythm Rescue:

YogaWorks' Core Strengthener focuses not only on building your core but also upper body strength:

In addition to the clips above ExerciseTV streams weekly 100+ new, free video clips. 

If videos are not your thing and you want to get fit in the fresh air you might find Walk Jog Run , an iPhone/iPad app that maps routes for calorie burn and distance, a useful tool (€2.39).