Suspension Training Plank Exercise . This video provides a basic exercise information with use of the suspension training plank exercise. Training with suspension straps will help you increase your muscle fibres. It's important maintain good breathing throughout this exercise, as often people tend to hold their breathe on the isometric hold. The exercise above primary focuses on working the core muscles and are worked well when you placing your feet in the suspension handles, as you place more weight on your legs increasing the tension in the exercise.