Breath work and being in the present is so amazing for calming right down whenever stress strikes. I’ve been doing yoga now for 15 years and love it. Doing Vinyasa Flow (there are many yoga options) taught me how to breath deeply, expanding the lungs, which is great for longevity and aging but also how to control my breath and I learned breathing techniques. Doing yoga truly is a moving meditation and helps one tie in the mind, the body and the spirit. For this reason, I feel Yoga is the best form of exercise out there and should certainly be incorporated into whatever other work out you engage in on a weekly basis.
Regarding meditation, here are a couple of videos on both the breath and meditation. Try taking a break for a minute to watch just one.
– check out this 13 minute Ted talk
And for the breath, if you feel that RIGHT NOW you really just need to BREATHE – close your eyes and breathe through a short 10 minute meditation from a Vipassana meditation teacher