Final answer:
Strength progression is achieved through the adjustment of weight, sets, and repetitions in a strength training regimen, aligning with the option 'b. Sets, repetitions, and intensity'.
Step-by-step explanation:
Progression in strength training is commonly achieved by manipulating three key components of an exercise regimen: weight, sets, and repetitions. Increasing weight makes it more challenging for the muscles and promotes growth and strength gains. Adjusting the number of sets performed can enhance muscular endurance or strength, depending on the volume and intensity applied. Finally, altering the repetitions per set can shift the focus between strength, hypertrophy, and endurance. Therefore, the answer to the question about progression in strength equipment training by increasing one or more elements for each exercise is 'b. Sets, repetitions, and intensity'.