l want to build up muscles at my body especially for biceps,chest and sixpack.My question is how to build up that muscles without using any equipment?

Hello, Thanks for the question. In regards to building your muscles without equipment you can focus on body weight exercises doing different variations of squats, dips, pushups, lunges, sit ups etc. Focus on contraction of the muscle, squeezing each rep and putting emphasis on form, tempo, and technique. If you do that you should be well on your way to achieving your goals without the use of equipment. Hope that helps! Go crush those goals!