Purpose: The study aimed to examine hamstring-quadriceps muscle activations of the supinebridge and reverse plank exercises that are performed for both improving the overall body strengthand contributing to the treatment in the process following an injury on different grounds.Methods: Ten participants (four males and six females, age=26.70±3.02 years) without regularsports habits were included in the study. Bilateral supine bridge and bilateral reverse plankexercises were practiced randomly on stable and unstable grounds. In the study, muscle activationvalues of vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF) and semitendinosus (SEM)muscles of the participants were examined. Along with the muscle activation that occurred duringthe exercise, hamstring (BF+SEM)/quadriceps (VM+VL) ratio was also determined (H:Q).Results: The lowest co-activation ratio (most balanced H:Q activation) was observed on stableground bridge exercise (5.83±4.04), and the largest co-activation ratio (hamstring dominantactivation) was observed on stable ground plank exercise (8.84±6.60). No significant differencewas found between exercises at H:Q co-activation ratio (p>0.05). A statistically significantdifference was found in the quadriceps and hamstring group in terms of exercise and differenceground in favor of plank (p<0.05).Conclusion: Reverse plank exercise has greater agonist muscle activation than the supine bridge.Therefore, it is thought that bridge exercise could be advised in the rehabilitation process thatnecessitates a high level of balance, especially in co-activation ratio. Further study with variousclinical problems may direct the process.