Muscles worked
The Smith bench press works the same muscles as a free-bar bench press: mainly your chest, helped by your triceps and the front of your shoulders. The difference is that the rails guide the bar, so the muscles around your shoulders and shoulder blades have less balancing to do. More of your effort can go into the press itself, and many people find it easier to feel their chest working. The bar moves straight up and down, whereas a free bar usually travels in a slight arc. With an incline bench under the bar, it becomes an incline press.
Common mistakes
- The safety stops are not set. Without them a failed rep has no safe way out. Set them to catch the bar just above your chest when you lie flat and relaxed on the bench.
- Letting go before the hooks catch. After the last rep, rotate the bar all the way back so the hooks engage. Feel that it is secure before you release your grip.
- Lying slack because the machine balances the bar. Pull your shoulder blades together, plant your feet and keep the same tension as with a free bar.
Variations and alternatives
- Switch to the bench press with a free bar when you want to train balance and let the bar find its own path.
- The dumbbell bench press lets each arm work on its own and gives a longer range at the bottom.
- The machine chest press is even more guided, and easy to take close to failure without a spotter.
Sets and reps
The Smith machine is a good choice when you train alone and want to go heavy, as the stops do the spotter's job. Strength sets of 3 to 6 reps work, and for muscle growth 3 to 4 sets of 6 to 12 fit well. Endurance sets of 12 to 20 reps are fine too. The sets and reps guide will help you choose.
The bar's own weight varies between machines, and some are counterbalanced. Note which machine you used and only compare with that one. Nor do the numbers carry straight over to a free bar, where balance comes into play. Once every set is done with good form, add 2.5 kg or one rep per set, in line with progressive overload.