// 필요한 권한 확인 및 요청
GoogleSignInAccount account = GoogleSignIn.getAccountForExtension(this, fitnessOptions);

// Google API Client 초기화
GoogleApiClient googleApiClient = new GoogleApiClient.Builder(this)
        .addApi(Fitness.SENSORS_API)
        .addScope(new Scope(Scopes.FITNESS_ACTIVITY_READ_WRITE))
        .addConnectionCallbacks(...).addOnConnectionFailedListener(...)
        .build();

// 센서 데이터 구독
Fitness.getSensorsClient(this, account)
        .add(new SensorRequest.Builder()
                .setDataType(DataType.TYPE_DISTANCE_DELTA)
                .setSamplingRate(1, TimeUnit.SECONDS)
                .build(), new OnDataPointListener() {
            @Override
            public void onDataPoint(DataPoint dataPoint) {
                // 데이터 처리
            }
        });

// 활동 기록
DataWriteRequest request = new DataWriteRequest.Builder()
        .setDataType(DataType.TYPE_ACTIVITY_SEGMENT)
        .setActivityField(Field.FIELD_ACTIVITY, "running")
        .setTimeInterval(startTime, endTime, TimeUnit.MILLISECONDS)
        .build();

Fitness.getHistoryClient(this, account)
        .insertData(request)
        .addOnSuccessListener(...).addOnFailureListener(...);