Exposing yourself to potentially harmful exercises should be avoided at all costs. Since a majority of people will experience low back pain during their lifetime, and it is the leading cause of limited physical activity in people 45 years of age and younger, many are looking for new alternatives to target their core. And that's where isometric training enters in.
These MUST-DO isometric core exercises are a great way to build your core stability and strength so that your core works properly all the time.
It's true you can train your core in just 7-minutes and although you're contracting your muscles you're not actually moving.