A haptic feedback mechanism is explored for personalized data interaction. Electrical muscle stimulation under the level of full contraction, in this paper described as electrical muscle signalling (EMS), is used for on-body and live data interactions as simplified cognitive processes for running purposes, such as data-assisted coaching, personalized feedback and injury prevention. In this research, we defined haptic electrical muscle signalling as feedback mechanism and the results concluded that (i.) muscle signalling under the level of contraction can be noticed in the form of pre-cramps, similar to a vibrating/contracting type of feedback on the skin, (ii.) feedback is able to trigger cognitive processes while running (iii.) and it does not negatively impact running performance or comfort. This is on-going research and future work is already in progress.