Hello
That is totally understandable! IBS and yoga can be tricky since certain poses or movements can definitely stimulate the digestive tract. As already pointed out by Epiphany, you can do some exercises to strenghten your pelvic floor and rectum muscles. Definitely try to work with your lower chakras and balance these. However, you should also work with your Third Eye and Sixth Chakra. The Moon, the Third Eye, and the Sixth, rules over the digestive tract. This has to do with the brain-gut axis, which strongly correlates to the Ida and Pingala channels (which are balanced through the Sun and Moon meditation.
Yogic Breathing techniques (pranayama's) can be excellent in preventing IBS-like symptoms as it reduces stress. This can be done right before you start your daily Yoga-routine.
The Sun/Moon Meditation is wonderful here, as it also contribute to balancing your energies!
For improving rectum muscles:
Start by sitting or lying down comfortably. Tighten the muscles around the anus/rectum and urethra as if you’re stopping the flow of urine or preventing gas. Hold the contraction for 3–5 seconds, then relax for the same amount of time. Aim for 10 repetitions at a time, and gradually work up to longer holds and more repetitions.
In addition, by reversing the practice above, or consciously relaxing the pelvic floor muscles, can be beneficial. This will teach you to have better awareness of muscle tension and relaxation.
To strenghten your pelvic floor, you can try out the following Yoga poses:
Setu Bandhasana aka bridge pose:
Lie on your back with your knees bent and feet flat on the ground, hip-width apart. As you lift your hips toward the ceiling, engage your glutes and the pelvic floor muscles, holding briefly before lowering. Repeat 8 or 10 times, focusing on contracting and lifting the pelvic floor as you lift your hips.
Malasana aka the Yogi squat:
Stand with feet wider than hip-width and lower into a squat, bringing your hands to a folding position at your chest. If possible, press your elbows into your knees for support. To engage the pelvic floor, try gently lifting the muscles as you hold the position for 20–30 seconds.
Food and timing:
Also, timing your meals might be beneficial to prevent further accidents. You could try to avoid eating a large meal 2–3 hours before doing yoga, which might reduce chances of sudden IBS symptoms during Yoga. If you need energy before Yoga, you could consider something light like a small banana or apple juice, which might be less triggering. Drinking a bit of warm water beforehand might also help to relax the digestive tract.
As SomewhatCoherent mentioned, probiotics may help manage IBS-symptoms, but their effectiveness do vary from person to person, as different strains target different symptoms.
I hope this helps! Take care