Set an incline bench (about 30–45°) under a Smith machine bar and lie back with your feet flat on the floor. Grip the bar with a close grip and extend your arms straight up. Keeping your upper arms fixed and elbows tucked, slowly lower the bar toward your forehead or slightly behind your head by bending your elbows. Pause briefly at the bottom for a stretch, then extend your arms to press the bar back up to the starting position.
Log your smith machine incline tricep extension sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.