i only get access to a gym 2 or 3 times a week. what are some things i can use at home to replace exercise equipment? I'm already doing push ups and situps. but i need to do other stuff i don't have the equipment for. example: pull ups and lifting weights.

I don't know if you like the bosu ball or exercise ball, but you can do some great strength training exercises with those...I also like the resistance ropes for arm workouts.

a chair perhaps?

Do you have a garage, if you do, theres your pull up and chin up equipment, the 2 parralell metal bars that help open your garage door on the roof.

Also, you can use 2 chairs to do dips

no,.......