While your bodyweight is really all that you need for a good interval routine, you may want to eventually increase the difficulty of your workouts. There are a few inexpensive fitness tools you can incorporate into your workouts that can add a challenge as well as more variety.

Resistance bands - these are fairly inexpensive, can be packed easily for traveling, and provide a good amount of resistance to your interval workouts.

Dumbbells - these are great for intervals using weights. I love using dumbbells for chest presses and squats. I use both in an interval routine and it is very effective. They are also inexpensive (ranging from $6 on up.)

Stability ball - a stability ball is so versatile. You can use it for the abs, legs, or like a bench for sitting or lying on while curling or chest pressing with dumbbells. I use it for my 10 minute workout with dumbbells.

Flat bench - this is probably the most expensive item but is great for step up exercises, incline push-ups, chest press, among other exercises.

Jump rope -  convenient and fun, the jump rope can be taken anywhere and used anywhere you have room to jump.

The above are just some bare essentials for creating a more challenging interval workout.  As you discover more interval routines, you will probably see some of the above fitness equipment used.  The cool thing is the above equipment will take up very little space and most are very affordable.

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