pacemaker (medical implement) / pacemaker (one who sets the pace in a race)

mount, equip, wear

mounting, equipping, wearing

(anatomy) a heart

pace (way of turn of events)

maker

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

Doing something at one's own personal pace or speed (unaffected by the pacing of peers).