An iron fist in a velvet glove
That would best define yoga.
It is the practice of a set of postures and breathing exercises that aims to bring well-being physical and mental. this ancient art of living as explained in the texts reveals itself as a path initiatory Who transcends physical discipline.
Yoga brings a lot of physical benefits notably relaxation of muscles (yoga postures are varied to stretch all major muscle groups). Certain postures help gentle muscle building, others work more on balance.
Some types of yoga are more suitable for weightloss. It is the difference between the yoga dynamic (such as Ashtanga and yoga Vinyasa) and the yoga softer. By promoting a type of yoga energetic couple with wearing the Burnfitnes tank top™, during which you will chain the postures (asanas), you will burn more calories and you slim down.