One tab per feature category — everything top-level, nothing nested behind a hub. The five tabs are always present; the same flow (browse → run → result) lives under Library, and the other pillars are one tap away.
Signature
Flat & predictable. Maximum discoverability and the gentlest learning curve, at the cost of a crowded tab bar (5 targets) and no single "do it now" emphasis.
1Library
Browse drills; filter by type. The default landing tab.
Library
AllCuratedCustomDry-fire
Bill Drill7 yd · 6 rds
HF 5.2
El Prez10 yd · 12 rds
HF 4.1
Dot Torturedry-fire
1-Reload-110 yd · custom
HF 3.8
Library
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2Drill detail
Tap a drill: video, specs, scoring. Run starts from here.