What the Country's Top Trainers Say Are Their Fitness Must Haves

Mandi Molnar, NYC Christopher St. DavidBartonGym

Gym bag essentials: Perform Better Resistance Bands in two resistance levels, Versa Grips, a soft ball to work out any tight muscles, and peanut butter. Always peanut butter.

Go-to workout equipment: Definitely dumbbells. They're versatile enough you can do a whole workout with one medium-weight set.

Pre- and post-workout snack: I usually shoot for rice cakes and peanut or almond butter, or trail mix. A little carb and little fat for energy, but not too heavy.