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Downloadable mobile applications for fitness management; Downloadable mobile applications for providing workouts; Downloadable mobile applications for providing coaching services; Downloadable mobile applications for providing training guideline for plank workouts; Downloadable mobile applications for customizing training plans for plank workouts; Downloadable mobile applications for providing coach tips and demo videos for plank workouts; Downloadable mobile applications for tracking training routine, weight loss progress and calories burned; Downloadable mobile applications for strengthening core muscle groups; Downloadable mobile applications for reducing back pain and lowering the risk of back and spinal column injuries; Downloadable mobile applications for improving flexibility, posture, and balance