A pair of push up bars has a first supporting stand, a second supporting stand and a handle. The first sleeve of the first supporting stand and the second sleeve of the second supporting stand provide different assembly depths. The handle is the long arm and the short arm of unequal length, which are combined with the first and second supporting stand respectively, so that the handle and the first and second supporting stand can be arbitrarily matched to have different use angles and states to improve the variability of the structure. It is only necessary to replace the first and second supporting stand with each other, which adds the convenience of structural change.