You know the saying: Sun’s out, guns out. So here’s a simple but effective training template to add an inch to your arms by summer.

Minute 1: Do 8 to 12 reps of a biceps exercise
Minute 2: Do 8 to 12 reps of a triceps exercise
Minute 3: Rest

That’s 1 round. Do 5 total rounds.

Perform this 15-minute routine to start your workout when you’re most fresh. Do it up to 3 times per week, switching up the variations every time you do it. This provides the right amount of volume, intensity, frequency, and variation for max gainz.

Speaking of variation, below are some of my favorite options for the biceps and triceps exercises.

Biceps: chinup, close-grip chinup, preacher curl, barbell/E-Z bar curl, dumbbell curlhammer curl, cable curl, Zottman curl

Triceps: dip, close-grip bench press, floor press, close-grip pushup, triceps extension, triceps pushdown, overhead triceps extension, board press

Progress from session to session by increasing your total rep count, using a heavier load (once you can do 5 sets of 12 reps, bump up the load), or choosing a more difficult exercise variation.

For the bodyweight exercises, add weight or use assistance as needed to stay within the 8 to 12 rep range. You can also use a more advanced variation of the same move. For example, elevate your feet on the close-grip pushups of you can get more than 12 on the floor.

In this Instagram video, I'm showing two of my favorite dumbbell options, both with a wrist twist.

Related: Build Your Best Body With THE 21-DAY METASHRED—an at-home body-shredding program from Men’s Health

You’ll also see what the last 4 reps should look like on the final set. You have to grind them out if you want to change.

Consider this your official call to arms. Now to get work, men!

This article originally appeared on MensHealth.com.