B1 Dumbbell bench press
Grab 2 dumbbells and lie on an exercise bench, feet planted firmly on the floor. Extend your arms towards the ceiling, palms facing each other, shoulder-width apart (a). Breathe in and smoothly lower the dumbbells to your chest (b), then exhale and drive them back to the starting position. That’s 1 rep. Do 6, then rest for 15 secs.
You want the weight to be challenging enough so you can just get six reps with perfect form.