Based on the collected experimental results shown in figure (both sections 1 and 2), for choosing an optimal catalyst, manganese and iron, were proposed as they practically outweigh other transition metals by efficiently reducing the activation energy of H2 activation which results in much easier fission of H-H bond. The bridging hydride intermediate should be somewhere in the middle of the stability range, between being unstable and extremely rigid in thermodynamics. Otherwise, the H2 activation or the subsequent hydrogenation would be suppressed. Hence, the kinetic and the thermodynamic factors are both of vital importance in the LA-TM catalysed H2 activation. From that point, not all transition metals, but only specific metals namely manganese and iron, which match the requirements such as kinetics and thermodynamics features, can be chosen for the process of activation of hydrogen molecules.