That is very limiting. There is a Fierce 5 dumbbell only routine which you can google. However, it does assume you can adjust the weight to suit the rep range specified.
Instead you'll just have to do more reps. Just keep going until you are 1 or 2 reps away from TRUE failure. Note that many people don't really know where this is so it's worth doing an all-out set to complete concentric failure initially so you have an idea. Progress by aiming to increase reps - you can expect reps in second and subsequent sets to drop off due to fatigue. That's fine. Perhaps just use the first set performance as a yardstick for progress.
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