Anger is implanted in us as sort of sting to make us gnash with our teeth against the devil to make us vehement against him not to set us in array against each other.
Flexibility is crucial to my fitness. Incorporating a good warm-up and cool-down into every session decreases my chances of injury. I use both dynamic and static stretching in my training. I've starting doing a few yoga sessions which incorporates muscle strength and flexibility.