It is generally recommended to perform each exercise with the maximum effort that you can sustain while maintaining proper form and technique. Still, the intensity may vary depending on the specific exercise and your goals.
For example, compound exercises such as squats, deadlifts, and bench presses may be performed with heavier weights and lower reps. In comparison, isolation exercises such as bicep curls and tricep extensions may be performed with lighter weights and higher reps.
However, it is important to note that working out at maximum intensity for all exercises can be very demanding on the body and may increase the risk of injury or overtraining. It is recommended to vary the intensity and volume of your workouts over time to avoid plateaus and reduce the risk of injury.