I’m a fitness expert – these are the Prime Day dumbbell deals I’d recommend

Peloton Dumbbells: now £33.75 at Amazon (was £45)
Save 25% — If you didn't know that Peloton have their own dumbbells, then now you do and they're pretty snazzy looking too. These start at £33.75 for a pair of 2.3kg, which increases as the weight goes up (max 13.6kg). What I like about these though, weirdly, is the shape, because they won't roll and are stackable. The handles also have decent knurling to aid grip and you can't deny how premium they look.

Bowflex SelectTech adjustable dumbbell: now £169 at Amazon (was £200)
Save 15% — If you don't have a home gym set-up or lack a lot of space, then I definitely recommend getting some adjustable dumbbells over regular ones. Bowflex are at the top of the game for this. All you have to do is simply spin the dial to select your desired weight, between two and 24kg, and you're good to go! This is the price for only one dumbbell, and I understand that buying two is expensive, but don't be fooled into thinking you can't workout with just one, because you can (hello single arm chest press) and it's a great way to ensure you've got no muscular imbalances either.

PROIRON Neoprene Dumbbell: now £11.97 at Amazon (was £13.87)
Save 15% — If you're completely new to using dumbbells, or just fancy a light pair to add a little bit of resistance to your bodyweight workouts, then these small neoprene ones will do nicely. They'll cost you £11.97 for a pair of 1kg dumbbells, with the price increasing with the weight. The dumbbell faces have slight flat edges to prevent rolling, while the rubber handles are more gentle on your hands.