diff --git a/internal/sbi/api_default.go b/internal/sbi/api_default.go
index 70bc577..204cbd8 100644
--- a/internal/sbi/api_default.go
+++ b/internal/sbi/api_default.go
@@ -18,5 +18,25 @@ func (s *Server) getDefaultRoute() []Route {
 			// Use
 			// curl -X GET http://127.0.0.163:8000/default/ -w "\n"
 		},
+		{
+			Name:    "Exercise GET",
+			Method:  http.MethodGet,
+			Pattern: "/exercise",
+			APIFunc: func(c *gin.Context) {
+				c.JSON(http.StatusOK, "This is get")
+			},
+		},
+		{
+			Name:    "Exercise POST",
+			Method:  http.MethodPost,
+			Pattern: "/exercise",
+			APIFunc: func(c *gin.Context) {
+				c.JSON(http.StatusOK, "This is post")
+			},
+		},
 	}
 }
+
+func (s *Server) RegisterDefaultRoutes(group *gin.RouterGroup) {
+	applyRoutes(group, s.getDefaultRoute())
+}
diff --git a/internal/sbi/api_default_test.go b/internal/sbi/api_default_test.go
new file mode 100644
index 0000000..ee0cccb
--- /dev/null
+++ b/internal/sbi/api_default_test.go
@@ -0,0 +1,74 @@
+package sbi_test
+
+import (
+	"bytes"
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/Alonza0314/nf-example/internal/sbi"
+	"github.com/gin-gonic/gin"
+)
+
+func TestDefaultRoot(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+
+	s := &sbi.Server{}
+	group := r.Group("/default")
+	s.RegisterDefaultRoutes(group)
+
+	req := httptest.NewRequest(http.MethodGet, "/default/", nil).WithContext(context.Background())
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status=%d, want 200", w.Code)
+	}
+	got := strings.TrimSpace(w.Body.String())
+	if got != `"Hello free5GC!"` {
+		t.Fatalf("body=%s, want %q", got, "Hello free5GC!")
+	}
+}
+
+func TestDefaultExerciseGET(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	s := &sbi.Server{}
+	group := r.Group("/default")
+	s.RegisterDefaultRoutes(group)
+
+	req := httptest.NewRequest(http.MethodGet, "/default/exercise", nil).WithContext(context.Background())
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status=%d, want 200", w.Code)
+	}
+	if strings.TrimSpace(w.Body.String()) != `"This is get"` {
+		t.Fatalf("body=%s, want %q", w.Body.String(), "This is get")
+	}
+}
+
+func TestDefaultExercisePOST(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	s := &sbi.Server{}
+	group := r.Group("/default")
+	s.RegisterDefaultRoutes(group)
+
+	req := httptest.NewRequest(http.MethodPost, "/default/exercise", bytes.NewBufferString(`{}`)).
+		WithContext(context.Background())
+	req.Header.Set("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status=%d, want 200", w.Code)
+	}
+	if strings.TrimSpace(w.Body.String()) != `"This is post"` {
+		t.Fatalf("body=%s, want %q", w.Body.String(), "This is post")
+	}
+}