These are some of my essential workout items depending on the type of workout I am attending or workouts I am doing at home. A lot of these can be found on amazon!
A yoga mat is needed for lots of workout classes and you can also use at home. Prices vary depending on brand! I got one for $20 at costco but the lululemon ones are a nice splurge.
Yoga Mats - Lululemon
A waist bag is a must if you are going on a hike or walk.
Belt Bags - Lululemon
a stainless steel water bottle. A must to keep your water cold. So many brands!
Insulated & Stainless Steel Water Bottles - Hydro Flask
Grippy socks. Needed for pilates classes or other similar classes.
Toesox - Grip Socks - Tavi
If you workout a lot this is great when you may get sore.