diff --git a/src/index.ts b/src/index.ts
index 1f29692..5faf813 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -14,6 +14,7 @@ import {
 } from './resources'
 import { RefreshTokenRequest } from './types'
 
+export * from './types'
 export * from './enums'
 export * from './models'
 
diff --git a/src/models/detailedActivity.ts b/src/models/detailedActivity.ts
index 52b427e..48bc253 100644
--- a/src/models/detailedActivity.ts
+++ b/src/models/detailedActivity.ts
@@ -1,4 +1,5 @@
 import { ActivityType, ResourceState } from '../enums'
+import { LatLng } from '../types'
 
 import {
   ActivityZone,
@@ -29,8 +30,8 @@ export interface DetailedActivity {
   start_date_local: string
   timezone: string
   utc_offset: number
-  start_latlng: number[]
-  end_latlng: number[]
+  start_latlng: LatLng
+  end_latlng: LatLng
   location_city: string
   location_state: string
   location_country: string
diff --git a/src/models/detailedSegment.ts b/src/models/detailedSegment.ts
index 7e24243..b6557ed 100644
--- a/src/models/detailedSegment.ts
+++ b/src/models/detailedSegment.ts
@@ -1,4 +1,5 @@
 import { PolylineMap, SummaryPRSegmentEffort, SummarySegmentEffort } from '.'
+import { LatLng } from '../types';
 
 enum ActivityType {
   Ride = 'Ride',
@@ -14,8 +15,8 @@ export interface DetailedSegment {
   maximum_grade: number
   elevation_high: number
   elevation_low: number
-  start_latlng: number[]
-  end_latlng: number[]
+  start_latlng: LatLng
+  end_latlng: LatLng
   climb_category: number
   city: string
   state: string
diff --git a/src/models/explorerSegment.ts b/src/models/explorerSegment.ts
index e6073c4..00f78e4 100644
--- a/src/models/explorerSegment.ts
+++ b/src/models/explorerSegment.ts
@@ -1,3 +1,5 @@
+import { LatLng } from "../types";
+
 enum ClimbCategoryDesc {
   NC = 'NC',
   ONE = '1',
@@ -13,8 +15,8 @@ export interface ExplorerSegment {
   climb_category: number
   climb_category_desc: ClimbCategoryDesc
   avg_grade: number
-  start_latlng: number[]
-  end_latlng: number[]
+  start_latlng: LatLng
+  end_latlng: LatLng
   elev_difference: number
   distance: number
   points: string
diff --git a/src/models/stream.ts b/src/models/stream.ts
index 1457723..ebb89a6 100644
--- a/src/models/stream.ts
+++ b/src/models/stream.ts
@@ -1,18 +1,25 @@
-export interface Stream {
-  type:
-    | 'time'
-    | 'distance'
-    | 'latlng'
-    | 'altitude'
-    | 'velocity_smooth'
-    | 'heartrate'
-    | 'cadence'
-    | 'watts'
-    | 'temp'
-    | 'moving'
-    | 'grade_smooth'
+import { LatLng, StreamKeys } from '..'
+
+export interface BaseStream<StreamKey extends StreamKeys, Data> {
+  type: StreamKey
   original_size: number
   resolution: 'low' | 'medium' | 'high'
   series_type: 'distance' | 'time'
-  data: number[]
+  data: Data[]
 }
+
+export type Stream = BaseStream<
+  | 'time'
+  | 'distance'
+  | 'altitude'
+  | 'velocity_smooth'
+  | 'heartrate'
+  | 'cadence'
+  | 'watts'
+  | 'temp'
+  | 'moving'
+  | 'grade_smooth',
+  number
+>
+
+export type LatLngStream = BaseStream<'latlng', LatLng>
diff --git a/src/models/streamSet.ts b/src/models/streamSet.ts
index 83ab48d..78aab9b 100644
--- a/src/models/streamSet.ts
+++ b/src/models/streamSet.ts
@@ -1,9 +1,9 @@
-import { Stream } from '.'
+import { LatLngStream, Stream } from '.'
 
 export interface StreamSet {
   time: Stream
   distance: Stream
-  latlng: Stream
+  latlng: LatLngStream
   altitude: Stream
   velocity_smooth: Stream
   heartrate: Stream
diff --git a/src/models/summaryActivity.ts b/src/models/summaryActivity.ts
index 16c4631..8dce222 100644
--- a/src/models/summaryActivity.ts
+++ b/src/models/summaryActivity.ts
@@ -1,4 +1,5 @@
 import { ActivityType, ResourceState } from '../enums'
+import { LatLng } from '../types'
 
 import { MetaAthlete, PolylineMap } from '.'
 
@@ -19,8 +20,8 @@ export interface SummaryActivity {
   start_date_local: string
   timezone: string
   utc_offset: number
-  start_latlng: number[]
-  end_latlng: number[]
+  start_latlng: LatLng
+  end_latlng: LatLng
   location_city: string
   location_state: string
   location_country: string
diff --git a/src/models/summarySegment.ts b/src/models/summarySegment.ts
index 63a0ece..391e2fa 100644
--- a/src/models/summarySegment.ts
+++ b/src/models/summarySegment.ts
@@ -1,4 +1,5 @@
 import { SummarySegmentEffort } from '.'
+import { LatLng } from '../types';
 
 enum ActivityType {
   Ride = 'Ride',
@@ -14,8 +15,8 @@ export interface SummarySegment {
   maximum_grade: number
   elevation_high: number
   elevation_low: number
-  start_latlng: number[]
-  end_latlng: number[]
+  start_latlng: LatLng
+  end_latlng: LatLng
   climb_category: number
   city: string
   state: string
diff --git a/src/types.ts b/src/types.ts
index 92d92e4..771120e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -10,3 +10,8 @@ export interface RefreshTokenResponse {
   expires_in: number
   refresh_token: string
 }
+
+/**
+ * Latitude, Longitude
+ */
+export type LatLng = [number, number]