Amp up your workout with a single $10 upgrade — mini resistance bands. You can take these a small, circular resistance bands with you anywhere. At the office? Secure it to your chair and try a few leg extensions. Traveling? Throw this into your suitcase and you won't have to sacrifice space or weight.
And while it's pretty obvious you can wrap one just above or below your knees or on your ankles and do banded walks (great for your hip flexors, by the way), you may be surprised at just how versatile this little band is. Here are 14 of the best exercises to add a resistance loop to.