Kickboards, Pull Buoys
Decathlons range of swim training gear will have you swimming out of your skin in no time. Pull buoys are put between your legs to let you focus on your pull technique (your stroke) while kickboards are a great way to practice your kicking technique. With this many options you'll be able to train what you want with ease. Fins, for both hands and feet, are another great way to build up strength for your swim.