Quick answer: the main base and side base are the two bases in a standard stunt group. In two-leg stunts they share the load fairly evenly, one foot each. In single-leg stunts like a liberty, the main base takes primary responsibility for the flyer's standing foot, while the side base supports that foot and helps keep the stunt level.
| Main Base | Side Base | |
|---|---|---|
| Typical focus | Primary control of the stunt | Matching, stabilising and assisting |
| In a two-leg stunt | Holds one of the flyer's feet | Holds the other foot - an even split |
| In a single-leg stunt | Takes the main responsibility for the flyer's standing foot | Supports the same foot and the main base's grip |
| Physical demand | Similar overall strength demand | Similar overall strength demand |
The Core Difference
Both roles are bases, but they aren't identical jobs. On a two-leg stunt like a prep or extension, each base holds one of the flyer's feet, so the split is fairly even. On a single-leg stunt like a liberty, both bases work on the same foot, and the difference becomes clear: the main base is in charge of that foot, while the side base supports it and the main base's grip.
Why the Split Exists
Two athletes holding one foot need a clear leader, or they'll fight each other for control. Making one base the main base gives the stunt one point of control for balance corrections, while the side base shares the weight and helps keep the platform level. Together with the back spot, they form a stable triangle around the flyer.
How Coaches Choose
Main bases are often the more experienced base in the group. But the two roles need similar strength, and the choice often depends on which leg the flyer stands on, how the group loads the stunt, and what works best for that particular flyer.
Communication
The main base and side base have to move as one: driving up on the same count, locking out at the same height and catching together. The back spot usually calls the counts, but the two bases also constantly adjust to each other - a base who is slightly late or low pulls the whole stunt off balance.
Can an Athlete Do Both?
Yes, and most experienced bases do. A base might be the main base for one flyer and the side base for another, or switch roles depending on which leg the flyer stands on in a single-leg stunt.
Related Roles
See Flyer for the role both bases support, and Base vs Back Spot for how basing compares with the role behind the stunt.